fixup! Make django_settings_is_configured return the first value always

Author: blueyed

pytest_django/lazy_django.py

@@ -8,7 +8,7 @@
 import pytest
 
 
-_cache = {}
+_django_settings_is_configured = None
 
 
 def skip_if_no_django():
@@ -24,17 +24,17 @@ def django_settings_is_configured():
     configured flag in the Django settings object if django.conf has already
     been imported.
     """
-    try:
-        return _cache["django_is_configured"]
-    except KeyError:
+    global _django_settings_is_configured
+
+    if _django_settings_is_configured is None:
         ret = bool(os.environ.get("DJANGO_SETTINGS_MODULE"))
 
         if not ret and "django.conf" in sys.modules:
             ret = sys.modules["django.conf"].settings.configured
 
-        _cache["django_is_configured"] = ret
+        _django_settings_is_configured = ret
 
-    return ret
+    return _django_settings_is_configured
 
 
 def get_django_version():