Fix that redis package is required

aiogram/fsm/__init__.py

@@ -1,19 +1,26 @@
+from contextlib import suppress
+
 from .context import FSMContext
 from .middleware import FSMContextMiddleware
 from .state import State, StatesGroup, StatesGroupMeta
 from .storage import (
     BaseEventIsolation,
     BaseStorage,
-    DefaultKeyBuilder,
     DisabledEventIsolation,
-    KeyBuilder,
     MemoryStorage,
     MemoryStorageRecord,
-    RedisEventIsolation,
-    RedisStorage,
     SimpleEventIsolation,
     StorageKey,
 )
+
+with suppress(ImportError):
+    from .storage import (
+        DefaultKeyBuilder,
+        KeyBuilder,
+        RedisEventIsolation,
+        RedisStorage,
+    )
+
 from .strategy import FSMStrategy, apply_strategy
 
 __all__ = (

aiogram/fsm/storage/__init__.py

@@ -1,3 +1,5 @@
+from contextlib import suppress
+
 from .base import BaseEventIsolation, BaseStorage, StorageKey
 from .memory import (
     DisabledEventIsolation,
@@ -5,7 +7,9 @@ from .memory import (
     MemoryStorageRecord,
     SimpleEventIsolation,
 )
-from .redis import DefaultKeyBuilder, KeyBuilder, RedisEventIsolation, RedisStorage
+
+with suppress(ModuleNotFoundError):
+    from .redis import DefaultKeyBuilder, KeyBuilder, RedisEventIsolation, RedisStorage
 
 __all__ = (
     "StorageKey",