fix: return False for empty string in is_email()#28

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RequiemBit wants to merge 1 commit intodaveoncode:masterfrom

RequiemBit:master

RequiemBit commented Jul 13, 2025

Closes Bump cryptography from 2.8 to 3.2 #18
Empty string should not be considered a valid email.
Added explicit if input_string == "": return False guard in is_email().
Added unit test to prevent regression.
All existing tests still pass.


          Update validation.py

aca4650

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