Let fmu-sumo-uploader improve error handling when user fails to login… (

#192)

src/sumo/wrapper/_auth_provider.py

@@ -57,7 +57,11 @@ def get_token(self):
         return result["access_token"]
 
     def get_authorization(self):
-        return {"Authorization": "Bearer " + self.get_token()}
+        token = self.get_token()
+        if token is None:
+            return ""
+
+        return {"Authorization": "Bearer " + token}
 
     pass