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SF #1022953: binascii.a2b_hqx("") raises SystemError
Several functions adopted the strategy of altering a full lengthed string copy and resizing afterwards. That would fail if the initial string was short enough (0 or 1) to be interned. Interning precluded the subsequent resizing operation. The solution was to make sure the initial string was at least two characters long. Added tests to verify that all binascii functions do not crater when given an empty string argument.
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