fix: smart account signing checktx error (backport #8665)

[mergify]

What is the purpose of the change

Found an issue where checktx would cause the FE to throw an error because check tx will throw an error based on generate sign bytes

if this code path is hit and the txn doen't have any auth data we throw a nil pointer
https://github.com/osmosis-labs/osmosis/blob/main/x/smart-account/authenticator/authentication_request.go#L253-L257

recovered: runtime error: invalid memory address or nil pointer dereference
stack:
goroutine 57378 [running]:
runtime/debug.Stack()
	/usr/local/go/src/runtime/debug/stack.go:24 +0x6b
github.com/cosmos/cosmos-sdk/baseapp.newDefaultRecoveryMiddleware.func1({0x702a6a0, 0xa1a68b0})
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/baseapp/recovery.go:74 +0x35
github.com/cosmos/cosmos-sdk/baseapp.newRecoveryMiddleware.func1({0x702a6a0, 0xa1a68b0})
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/baseapp/recovery.go:42 +0x51
github.com/cosmos/cosmos-sdk/baseapp.processRecovery({0x702a6a0, 0xa1a68b0}, 0xc00212e648)
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/baseapp/recovery.go:31 +0x71
github.com/cosmos/cosmos-sdk/baseapp.processRecovery({0x702a6a0, 0xa1a68b0}, 0xc0b6ddf698)
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/baseapp/recovery.go:36 +0xf1
github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).runTx.func1()
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/baseapp/baseapp.go:835 +0x10b
panic({0x702a6a0?, 0xa1a68b0?})
	/usr/local/go/src/runtime/panic.go:770 +0x136
github.com/cosmos/cosmos-sdk/x/auth/tx.(*wrapper).GetSigningTxData(0xc0b1e8b200)
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/x/auth/tx/adapter.go:63 +0xb6d
github.com/cosmos/cosmos-sdk/x/auth/signing.GetSignBytesAdapter({0x8132380, 0xc0b75bfc08}, 0xc001174720, 0x1, {{0x0, 0x0}, {0xc001a76240, 0x9}, 0x264fb0, 0x1f9, ...}, ...)
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/x/auth/signing/adapter.go:37 +0x14e
github.com/osmosis-labs/osmosis/v26/x/smart-account/authenticator.GenerateAuthenticationRequest({{0x8132540, 0xa3e29c0}, {0x81507c8, 0xc0b6dfff40}, {{0x0, 0x0}, {0xc001a76240, 0x9}, 0x13540bf, {0x146b959e, ...}, ...}, ...}, ...)
	/home/ghost/git/osmosis-labs/osmosis/x/smart-account/authenticator/authentication_request.go:254 +0xd65
github.com/osmosis-labs/osmosis/v26/x/smart-account/post.AuthenticatorPostDecorator.PostHandle({_, _, _, _, {_, _}}, {{0x8132540, 0xa3e29c0}, {0x81507c8, 0xc0b6dfff40}, ...}, ...)
	/home/ghost/git/osmosis-labs/osmosis/x/smart-account/post/post.go:102 +0x1016
github.com/cosmos/cosmos-sdk/types.ChainPostDecorators.func2({{0x8132540, 0xa3e29c0}, {0x81507c8, 0xc0b6dfff40}, {{0x0, 0x0}, {0xc001a76240, 0x9}, 0x13540bf, {0x146b959e, ...}, ...}, ...}, ...)
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/types/handler.go:76 +0x1c6
github.com/osmosis-labs/osmosis/v26/x/protorev/keeper.ProtoRevDecorator.PostHandle({{{0x814fcd8, 0xc000d029c0}, {0x80f8ed0, 0xc002e7c980}, 0xc002e7ca10, {{0x814fcd8, 0xc000d029c0}, 0xc000131378, {0x80f8ed0, 0xc002e7c800}, ...}, ...}}, ...)
	/home/ghost/git/osmosis-labs/osmosis/x/protorev/keeper/posthandler.go:36 +0x15a
github.com/cosmos/cosmos-sdk/types.ChainPostDecorators.func2({{0x8132540, 0xa3e29c0}, {0x81507c8, 0xc0b6dfff40}, {{0x0, 0x0}, {0xc001a76240, 0x9}, 0x13540bf, {0x146b959e, ...}, ...}, ...}, ...)
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/types/handler.go:76 +0x1c6
github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).runTx(0xc001a4efc8, 0x2, {0xc0afa76420, 0x156, 0x160})
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/baseapp/baseapp.go:966 +0x1c8a
github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).Simulate(0xc001a4efc8, {0xc0afa76420, 0x156, 0x160})
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/baseapp/test_helpers.go:28 +0xa5
github.com/cosmos/cosmos-sdk/x/auth/tx.txServer.Simulate({{{0x0, 0x0, 0x0}, {0x8155208, 0xc0019b5110}, 0x0, {0x0, 0x0}, {0x816f488, 0xc0010e8d70}, ...}, ...}, ...)
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/x/auth/tx/service.go:98 +0x35a
github.com/cosmos/cosmos-sdk/types/tx._Service_Simulate_Handler.func1({0x8132460, 0xc0b70a3770}, {0x74dcfa0, 0xc0b6da22c0})
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/types/tx/service.pb.go:1443 +0xf1
github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).RegisterGRPCServer.func1({0x8132460, 0xc0b70a3770}, {0x74dcfa0, 0xc0b6da22c0}, 0xc0b6da22e0, 0xc0b2871938)
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/baseapp/grpcserver.go:85 +0xd09
github.com/grpc-ecosystem/go-grpc-middleware.ChainUnaryServer.func2.1({0x8132460, 0xc0b6dbcff0}, {0x74dcfa0, 0xc0b6da22c0})
	/home/ghost/go/pkg/mod/github.com/grpc-ecosystem/[email protected]/chain.go:48 +0xe3
github.com/grpc-ecosystem/go-grpc-middleware/recovery.UnaryServerInterceptor.func1({0x8132460, 0xc0b6dbcff0}, {0x74dcfa0, 0xc0b6da22c0}, 0xc0b6da22e0, 0xc0b6db8380)
	/home/ghost/go/pkg/mod/github.com/grpc-ecosystem/[email protected]/recovery/interceptors.go:33 +0x1d6
github.com/grpc-ecosystem/go-grpc-middleware.ChainUnaryServer.func2({0x8132460, 0xc0b6dbcff0}, {0x74dcfa0, 0xc0b6da22c0}, 0xc0b6da22e0, 0xc0b2871938)
	/home/ghost/go/pkg/mod/github.com/grpc-ecosystem/[email protected]/chain.go:53 +0x223
github.com/cosmos/cosmos-sdk/types/tx._Service_Simulate_Handler({0x749a800, 0xc0007732c0}, {0x8132460, 0xc0b6dbcff0}, 0xc0b1e8af80, 0xc0b6dbd020)
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/types/tx/service.pb.go:1445 +0x22c
github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).RegisterGRPCServer.func2({0x749a800, 0xc0007732c0}, {0x8132460, 0xc0b6dbcff0}, 0xc0b1e8af80, 0x0)
	/home/ghost/go/pkg/mod/github.com/osmosis-labs/[email protected]/baseapp/grpcserver.go:107 +0x17d
google.golang.org/grpc.(*Server).processUnaryRPC(0xc002814400, {0x8132460, 0xc0b6dbcf00}, {0x814d2a0, 0xc000f7a780}, 0xc0b2879560, 0xc001a26240, 0xc0018d6380, 0x0)
	/home/ghost/go/pkg/mod/google.golang.org/[email protected]/server.go:1379 +0x180d
google.golang.org/grpc.(*Server).handleStream(0xc002814400, {0x814d2a0, 0xc000f7a780}, 0xc0b2879560)
	/home/ghost/go/pkg/mod/google.golang.org/[email protected]/server.go:1790 +0x1053
google.golang.org/grpc.(*Server).serveStreams.func2.1()
	/home/ghost/go/pkg/mod/google.golang.org/[email protected]/server.go:1029 +0x178
created by google.golang.org/grpc.(*Server).serveStreams.func2 in goroutine 533
	/home/ghost/go/pkg/mod/google.golang.org/[email protected]/server.go:1040 +0x1ae
: panic [osmosis-labs/[email protected]/baseapp/recovery.go:72] with gas used: '359115'
```<hr>This is an automatic backport of pull request #8665 done by [Mergify](https://mergify.com).