Improved common_places error logging

source/RobotAPI/libraries/PriorKnowledge/util/CommonPlaceLoader/CommonPlaceLoader.cpp

@@ -12,8 +12,7 @@ namespace armarx::priorknowledge::util
         std::vector<CommonPlace> ret;
         if (not js.contains("common_places"))
         {
-            ARMARX_WARNING << "The common_places file has the wrong structure. Missing key "
-                              "'common_places'.";
+            ARMARX_WARNING << "The common_places file (" << source << ") has the wrong structure. Missing key 'common_places'.";
             return ret;
         }