Merge pull request #15 from GreenDeploy-io/dont-check-when-no-databas…

…e-is-set

♻️ REFACTOR check_database_backend_is_postgres

django_ltree/checks.py

@@ -8,7 +8,7 @@ def check_database_backend_is_postgres(app_configs, **kwargs):
     errors = []
     valid_dbs = ["postgres", "postgis"]
 
-    if not any(d in settings.DATABASES["default"]["ENGINE"] for d in valid_dbs):
+    if "default" in settings.DATABASES and all(d not in settings.DATABASES["default"]["ENGINE"] for d in valid_dbs):
         errors.append(
             Warning(
                 "django_ltree needs postgres to support install the ltree extension.",