Refactor conditional logic for response handling

- Adjusted code to handle different scenarios when processing responses.

index.php

@@ -13,8 +13,12 @@ if(php_sapi_name() == 'cli' || $_SERVER["REQUEST_URI"] == '/metrics') {
             if (isset($submetric['command'])) {
                 $output = null;
                 $retval = null;
-                exec($submetric['command'], $output, $retval);
-                $output = implode("\n", $output);
+                try {
+                    exec($submetric['command'], $output, $retval);
+                    $output = implode("\n", $output);
+                } catch (Exception $e) {
+                    $output = '';
+                }
             } elseif (isset($submetric['http'])) {
                 $client = new GuzzleHttp\Client();
 
@@ -43,9 +47,17 @@ if(php_sapi_name() == 'cli' || $_SERVER["REQUEST_URI"] == '/metrics') {
                 }
 
                 if (isset($submetric['http']['data']) && $submetric['http']['data'] == 'responsebody') {
-                    $output = $res->getBody()->getContents();
+                    if ($hasresponse) {
+                        $output = $res->getBody()->getContents();
+                    } else {
+                        $output = '';
+                    }
                 } elseif ((isset($submetric['http']['statuscode'])) && (isset($submetric['http']['data']) && $submetric['http']['data'] == 'hasresponse')) {
-                    $output = (int)in_array($res->getStatusCode(), $submetric['http']['statuscode']);
+                    if ($hasresponse) {
+                        $output = $output = (int)in_array($res->getStatusCode(), $submetric['http']['statuscode']);;
+                    } else {
+                        $output = 0;
+                    }
                 } elseif (isset($submetric['http']['data']) && $submetric['http']['data'] == 'hasresponse') {
                     $output = (int)$hasresponse;
                 }