Added a missing import and removed an unneeded import

Author: alex

django/contrib/gis/geos/prepared.py

@@ -1,4 +1,5 @@
 from .base import GEOSBase
+from .error import GEOSException
 from .geometry import GEOSGeometry
 from .libgeos import geos_version_info
 from .prototypes import prepared as capi

tests/swappable_models/tests.py

@@ -2,7 +2,6 @@
 
 from django.utils.six import StringIO
 
-from django.apps import apps
 from django.contrib.auth.models import Permission
 from django.contrib.contenttypes.models import ContentType
 from django.core import management