Update gef.py

Co-authored-by: crazy hugsy <[email protected]>

gef.py

@@ -8905,7 +8905,7 @@ def do_invoke(self, _: List[str], **kwargs: Any) -> None:
         names: List[str] = [x for x in args.name]
 
         for arg in args.unknown_types:
-            if arg is '':
+            if not arg:
                 continue
 
             if self.is_integer(arg):