remove connection error in fresh install, mongo setting in dev environment

awx/main/migrations/_system_tracking.py

@@ -20,6 +20,10 @@ def migrate_facts(apps, schema_editor):
     Fact = apps.get_model('main', "Fact")
     Host = apps.get_model('main', "Host")
 
+    if (not hasattr(settings, 'MONGO_HOST')) or settings.MONGO_HOST == NotImplemented:
+        # If settings do not specify a mongo database, do not raise error or drop db
+        return (0, 0)
+
     try:
         n = FactVersion.objects.all().count()
     except ConnectionError:

awx/settings/local_settings.py.docker_compose

@@ -51,7 +51,7 @@ if is_testing(sys.argv):
 BROKER_URL = 'redis://redis/'
 
 # Mongo host configuration
-MONGO_HOST = 'mongo'
+MONGO_HOST = NotImplemented
 
 # Set True to enable additional logging from the job_event_callback plugin
 JOB_CALLBACK_DEBUG = False