headers can also be empty dict

Author: tschaume

mpcontribs-client/mpcontribs/client/__init__.py

@@ -573,7 +573,7 @@ def __init__(
         if not apikey:
             apikey = os.environ.get("MPCONTRIBS_API_KEY")
 
-        if apikey and headers is not None:
+        if apikey and headers:
             apikey = None
             logger.debug("headers set => ignoring apikey!")