8079841: Buffer underflow with empty zip entry names
Summary: check for zero-length entry name before accessing "last" byte
Reviewed-by: sherman, martin
trueTypeError: Cannot get property "foo" of nulltrueTypeError: Cannot get property "foo" of nulltrueTypeError: Cannot set property "foo" of nulltrueTypeError: Cannot set property "foo" of nulltrueTypeError: null has no such function "foo"trueTypeError: null is not a function