Fix exceptions printing logic in run.py

Author: Locked-chess-official

Lib/idlelib/run.py

@@ -282,6 +282,7 @@ def print_exc_group(typ, exc, tb, prefix=""):
             else:
                 print(f"{prefix2}  | <exception {type(sub).__name__} has printed>")
                 need_print_underline = True
+            need_print_underline *= (i == len(exc.exceptions))
             if need_print_underline:
                 print(f"{prefix2}  +------------------------------------", file=efile)