Remove unused variable assignments

exceptions/generic/MDmainEntityNotExistentException.php

@@ -13,8 +13,7 @@ final class MDmainEntityNotExistentException extends Exception {
      */
     public function errorMessage() {
         //error message
-        $errorMsg = 'Could not connect to databse. Please try again later.';
-        return $errorMsg;
+        return 'Could not connect to databse. Please try again later.';
 
     }
 }