[1.10.x] Fixed #27004 -- Made migrations consistency check ignore unapplied squashed migrations.

Backport of d117567c7d from master

tests/migrations/test_migrations_squashed_extra/0003_third.py

@@ -0,0 +1,8 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    dependencies = [("migrations", "0002_second")]