mustParseBool should default to false when string is empty

[krisis]

mustParseBool is a utility function that parses boolean value set in an shell environment variable. Most *nix shell programs leave environment variables unset to indicate false. So, mustParseBool should default to false when an empty string is passed.
E.g, If ENABLE_HTTPS environment variable is not set mustParseBool(os.Getenv("ENABLE_HTTPS")) should be false.

[vadmeste]

E.g, ENABLE_HTTPS environment variable is not set mustParseBool(os.Getenv("ENABLE_HTTPS")) should be false.

I agree since this is only for testing..