chore: fix pycharm complaints

aerich/migrate.py

@@ -7,7 +7,7 @@
 
 import asyncclick as click
 from dictdiffer import diff
-from tortoise import BaseDBAsyncClient, Model, Tortoise
+from tortoise import BaseDBAsyncClient, ConfigurationError, Model, Tortoise
 from tortoise.exceptions import OperationalError
 from tortoise.indexes import Index
 
@@ -248,6 +248,8 @@ def _handle_m2m_fields(
                     if new_m2m_field["name"] == new_value:
                         table = cast(str, new_m2m_field.get("through"))
                         break
+                else:
+                    raise ConfigurationError(f"{new_value!r} not found in new_m2m_fields!")
             else:
                 table = new_value.get("through")
             if action == "add":
@@ -405,7 +407,7 @@ def diff_models(
                                     if new_model_str not in models_with_rename_field:
                                         if models_with_rename_field:
                                             # When there are multi rename fields with different models,
-                                            # print a empty line to warn that is another model
+                                            # print an empty line to warn that is another model
                                             prefix = "\n" + prefix
                                         models_with_rename_field.add(new_model_str)
                                     is_rename = click.prompt(
@@ -603,7 +605,7 @@ def _resolve_fk_fields_name(cls, model: Type[Model], fields_name: Iterable[str])
             try:
                 field = model._meta.fields_map[field_name]
             except KeyError:
-                # field dropped or to be add
+                # field dropped or to be added
                 pass
             else:
                 if field.source_field:
@@ -695,7 +697,7 @@ def _add_fk(
     @classmethod
     def _merge_operators(cls) -> None:
         """
-        fk/m2m/index must be last when add,first when drop
+        fk/m2m/index must be last when add, first when drop
         :return:
         """
         for _upgrade_fk_m2m_operator in cls._upgrade_fk_m2m_index_operators: