Improve error catching to prevent silent errors

grade.php

@@ -90,9 +90,8 @@ $postBody = str_replace(
 	array($sourcedid, $grade, $operation, uniqid()),
 	getPOXGradeRequest());
 
-$response = sendOAuthBodyPOST($method, $endpoint, $oauth_consumer_key, $oauth_consumer_secret, $content_type, $postBody);
-
 try {
+    $response = sendOAuthBodyPOST($method, $endpoint, $oauth_consumer_key, $oauth_consumer_secret, $content_type, $postBody);
     $retVal = parseResponse($response);
 } catch(Exception $e) {
     echo json_encode(Array("status" => "failure", "detail" => $e->getMessage(), "response" => $response));