Remove unused variable assignments

exceptions/updates/MDcouldNotSaveException.php

@@ -2,8 +2,7 @@
 declare(strict_types = 1);
 
 /**
- * Exception thrown in case the main entity of a page (e.g. an object, an institution etc.)
- * are not set public.
+ * Exception thrown in case an update failed.
  */
 final class MDcouldNotSaveException extends Exception {
     /**
@@ -13,8 +12,7 @@ final class MDcouldNotSaveException extends Exception {
      */
     public function errorMessage() {
         //error message
-        $errorMsg = 'Could not save.';
-        return $errorMsg;
+        return 'Could not save.';
 
     }
 }