[utils] Sub-select apps which are installed before restoring

beat/web/utils/management/commands/restore.py

@@ -37,7 +37,7 @@ import tempfile
 from django.core.management import call_command
 from django.core.management.base import BaseCommand, CommandError
 from django.conf import settings
-from django.apps import apps
+from django.apps import apps, registry
 
 from .backup import APPS
 
@@ -102,6 +102,11 @@ class Command(BaseCommand):
 
             exclude = arguments.get('exclude')
 
+            # remove uninstalled apps
+            global APPS
+            installed_apps = registry.apps.all_models.keys()
+            exclude += [app for app in APPS if app not in installed_apps]
+
             arguments = dict(
                     verbosity=arguments.get('verbosity'),
                     interactive=False,