Fix Portable PreCommit on 3.14 (#38033)

* Fix Portable PreCommit on 3.14

* linting

Author: jrmccluskey

sdks/python/apache_beam/runners/portability/portable_runner.py

@@ -144,12 +144,15 @@ def add_runner_options(parser):
         try:
           # no default values - we don't want runner options
           # added unless they were specified by the user
-          add_arg_args = {'action': 'store', 'help': option.description}
+          add_arg_args = {'action': 'store'}
+          if option.description is not None:
+            # Prevent bare %'s in help strings in 3.14+
+            add_arg_args['help'] = option.description.replace("%", "%%")
           if option.type == beam_job_api_pb2.PipelineOptionType.BOOLEAN:
             add_arg_args['action'] = 'store_true' \
               if option.default_value != 'true' else 'store_false'
           elif option.type == beam_job_api_pb2.PipelineOptionType.INTEGER:
-            add_arg_args['type'] = int
+            add_arg_args['type'] = int  # type: ignore
           elif option.type == beam_job_api_pb2.PipelineOptionType.ARRAY:
             add_arg_args['action'] = 'append'
           parser.add_argument("--%s" % option.name, **add_arg_args)