blanket try-catch to ensure following unpatch code (#6385)

* blanket try-catch to ensure following unpatch code

* review comments

* comments

Author: williexu

src/command_modules/azure-cli-interactive/azure/cli/command_modules/interactive/azclishell/az_completer.py

@@ -205,8 +205,11 @@ def mute_parse_args(self, text):
         AzCliCommandParser.error = error_pass
         AzCliCommandParser._check_value = _check_value_muted
 
-        parse_args = self.argsfinder.get_parsed_args(
-            parse_quotes(text, quotes=False, string=False))
+        # No exception is expected. However, we add this try-catch block, as this may have far-reaching effects.
+        try:
+            parse_args = self.argsfinder.get_parsed_args(parse_quotes(text, quotes=False, string=False))
+        except Exception:  # pylint: disable=broad-except
+            pass
 
         AzCliCommandParser.error = error
         AzCliCommandParser._check_value = _check_value