Fixed #15888 -- Made tablename argument of createcachetable optional

Thanks Aymeric Augustin for the report and the documentation and
Tim Graham for the review.

django/contrib/gis/db/backends/spatialite/creation.py

@@ -1,8 +1,6 @@
 import os
 
 from django.conf import settings
-from django.core.cache import get_cache
-from django.core.cache.backends.db import BaseDatabaseCache
 from django.core.exceptions import ImproperlyConfigured
 from django.db.backends.sqlite3.creation import DatabaseCreation
 
@@ -55,10 +53,7 @@ class SpatiaLiteCreation(DatabaseCreation):
             interactive=False,
             database=self.connection.alias)
 
-        for cache_alias in settings.CACHES:
-            cache = get_cache(cache_alias)
-            if isinstance(cache, BaseDatabaseCache):
-                call_command('createcachetable', cache._table, database=self.connection.alias)
+        call_command('createcachetable', database=self.connection.alias)
 
         # Get a cursor (even though we don't need one yet). This has
         # the side effect of initializing the test database.