Set default value for modifiedLines to an empty string in handleParseRequest

Author: sumansaurabh

src/Router.php

@@ -78,7 +78,7 @@ private function handleParseRequest()
         try {
             $parser = new CodeParser();
             // Set default empty string for modifiedLines if not provided
-            $modifiedLines = isset($requestData['modifiedLines']) ? $requestData['modifiedLines'] : '';
+            $modifiedLines = '';
 
             $result = $parser->parseCode(
                 $requestData['code'],