Fix fact database migration

For new installs the database may not be online and thus the migration
can't happen.  This will allow it to continue but we may want more
messaging to the user running potential upgrades

awx/main/migrations/0005_v300_changes.py

@@ -7,7 +7,7 @@ from django.db import migrations
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('main', '0004_v300_fact_changes'),
+        ('main', '0004_v300_changes'),
     ]
 
     operations = [

awx/main/migrations/0006_v300_changes.py

@@ -107,7 +107,7 @@ def create_system_job_templates(apps, schema_editor):
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('main', '0005_v300_fact_migrations'),
+        ('main', '0005_v300_changes'),
     ]
 
     operations = [

awx/main/migrations/_system_tracking.py

@@ -16,7 +16,12 @@ def migrate_facts(apps, schema_editor):
     Fact = apps.get_model('main', "Fact")
     Host = apps.get_model('main', "Host")
 
-    # TODO: Check to see if mongo connection works and mongo is on.
+    try:
+        n = FactVersion.objects.all().count()
+    except ConnectionError:
+        # TODO: Let the user know about the error.  Likely this is
+        # a new install and we just don't need to do this
+        return (0, 0)
 
     migrated_count = 0
     not_migrated_count = 0