fix: fixed quality issues

Author: irfanuddinahmad

cms/djangoapps/contentstore/models.py

@@ -17,10 +17,12 @@
 from opaque_keys.edx.locator import LibraryContainerLocator
 from openedx_content.api import get_published_version
 from openedx_content.models_api import Component, Container
+
 try:
     from openedx_django_lib.fields import immutable_uuid_field, manual_date_time_field, ref_field
-except Exception:  # pragma: no cover - runtime compatibility shim for different openedx_django_lib versions
-    from openedx_django_lib.fields import immutable_uuid_field, manual_date_time_field, key_field as ref_field
+except ImportError:  # pragma: no cover - runtime compatibility shim for different openedx_django_lib versions
+    from openedx_django_lib.fields import immutable_uuid_field, manual_date_time_field
+    from openedx_django_lib.fields import key_field as ref_field
 
 logger = logging.getLogger(__name__)