Updated unit test

Author: kmvanbrunt

cmd2/cmd2.py

@@ -1419,6 +1419,7 @@ def complete(self, text: str, state: int) -> Optional[str]:
         except CompletionError as e:
             err_str = str(e)
             if err_str:
+                # Don't print error and redraw the prompt unless the error has length
                 ansi.style_aware_write(sys.stdout, err_str + '\n')
                 rl_force_redisplay()
             return None

tests/test_argparse_completer.py

@@ -699,7 +699,7 @@ def test_completion_items_default_header(ac_app):
     ('hint', '', True),
     ('hint --flag', '', True),
     ('hint --suppressed_help', '', False),
-    ('hint --suppressed_hint', '--', False),
+    ('hint --suppressed_hint', '', False),
 
     # Hint because flag does not have enough values to be considered finished
     ('nargs --one_or_more', '-', True),
@@ -730,7 +730,10 @@ def test_autocomp_hint(ac_app, command_and_args, text, has_hint, capsys):
 
     complete_tester(text, line, begidx, endidx, ac_app)
     out, err = capsys.readouterr()
-    assert has_hint == ("Hint:\n" in out)
+    if has_hint:
+        assert "Hint:\n" in out
+    else:
+        assert not out
 
 
 def test_autocomp_hint_no_help_text(ac_app, capsys):