8079841: Buffer underflow with empty zip entry names Summary: check for zero-length entry name before accessing "last" byte Reviewed-by: sherman, martin

1,2,3,4,5,6+
−
first: true+
−
1,2,3,4,5,6+
−
1,2,3,,,,4711.17,dingo!,4,5,6+
−
second: true+
−
1,2,3,,,,4711.17,dingo!,4,5,6+
−