[1.10.x] Fixed #26930 -- Prevented makemigrations from accessing an empty database.

Thanks Liz Lemon for the report and investigation and
Claude Paroz for the test.

Backport of aad46c3e370e105f9117a337924090d05f1b001d from master

1 files changed, 3 insertions, 1 deletions

diff --git a/django/core/management/commands/makemigrations.py b/django/core/management/commands/makemigrations.py
index b8c05486fc..f9f50cc2ad 100644
--- a/django/core/management/commands/makemigrations.py
+++ b/django/core/management/commands/makemigrations.py
@@ -95,7 +95,9 @@ class Command(BaseCommand):
 
         # Raise an error if any migrations are applied before their dependencies.
         for db in connections:
-            loader.check_consistent_history(connections[db])
+            connection = connections[db]
+            if connection.settings_dict['ENGINE'] != 'django.db.backends.dummy':
+                loader.check_consistent_history(connection)
 
         # Before anything else, see if there's conflicting apps and drop out
         # hard if there are any and they don't want to merge