Send NULL insteadof empty feedback when sending score

core/src/main/java/nl/tudelft/ewi/auta/core/controller/SubmitAppController.java

@@ -291,7 +291,7 @@ public class SubmitAppController extends ControllerBase
      */
     private void sendFeedback(
             final URL url,
-            final String report,
+            final @Nullable String report,
             final String visibleFor,
             final SubmitAppMetadata submitMetadata,
             final @Nullable Integer score
@@ -348,7 +348,11 @@ public class SubmitAppController extends ControllerBase
             score = -1;
         }
 
-        this.sendFeedback(url, "", "STUDENT", submitMetadata, score);
+        logger.info("Sending score {} to Submit for submission {} as script {}",
+                score, submitMetadata.getSubmissionId(), submitMetadata.getScriptId()
+        );
+
+        this.sendFeedback(url, null, "STUDENT", submitMetadata, score);
     }
 
     /**