python: Remove extra pass statements with autoflake.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

zerver/lib/import_realm.py

@@ -225,7 +225,6 @@ class FakeMessage:
     We just need a stub object for do_render_markdown
     to write stuff to.
     '''
-    pass
 
 def fix_message_rendered_content(realm: Realm,
                                  sender_map: Dict[int, Record],
@@ -416,7 +415,6 @@ def re_map_foreign_keys_internal(data_table: List[Record],
                 # subscription object
                 # check function 'get_huddles_from_subscription'
                 ID_MAP['recipient_to_huddle_map'][item['id']] = lookup_table[old_id]
-                pass
             else:
                 continue
         old_id = item[field_name]

zerver/lib/rate_limiter.py

@@ -153,7 +153,6 @@ class RateLimiterBackend(ABC):
     @abstractmethod
     def block_access(cls, entity_key: str, seconds: int) -> None:
         "Manually blocks an entity for the desired number of seconds"
-        pass
 
     @classmethod
     @abstractmethod

zerver/lib/test_runner.py

@@ -477,7 +477,6 @@ class Runner(DiscoverRunner):
             shutil.rmtree(TEST_RUN_DIR)
         except OSError:
             print("Unable to clean up the test run's directory.")
-            pass
         return super().teardown_test_environment(*args, **kwargs)
 
     def test_imports(self, test_labels: List[str], suite: Union[TestSuite, ParallelTestSuite]) -> None:

zproject/backends.py

@@ -367,7 +367,6 @@ ldap_logger = logging.getLogger("zulip.ldap")
 class ZulipLDAPException(_LDAPUser.AuthenticationFailed):
     """Since this inherits from _LDAPUser.AuthenticationFailed, these will
     be caught and logged at debug level inside django-auth-ldap's authenticate()"""
-    pass
 
 class ZulipLDAPExceptionNoMatchingLDAPUser(ZulipLDAPException):
     pass