No HTTP errors handling

[sergeolkhovik]

I've got a problem with SSL CA but this library didn't catch that and kept returning empty string.
This isn't good, I think the library should check HTTP response code. I updated code a little, please review the following patch:

% cat sendgrid.patch 
# This patch file was generated by NetBeans IDE
# Following Index: paths are relative to: libraries/SendGrid-PHP-Library/sendgrid/core
# This patch can be applied using context Tools: Patch action on respective folder.
# It uses platform neutral UTF-8 encoding and \n newlines.
# Above lines and this line are ignored by the patching process.
Index: sendgrid-connect.php
--- sendgrid-connect.php Base (BASE)
+++ sendgrid-connect.php Locally Modified (Based On LOCAL)
@@ -55,7 +55,7 @@
     * sendgrid endpoint ...
     * @var string
     */
-   const SG_ENDPOINT = 'https://sendgrid.com/api';
+   const SG_ENDPOINT = 'https://api.sendgrid.com/api';
 
    /**
     * Creates a new SendGrid Newsletter API object to make calls with
@@ -119,8 +119,10 @@
 
        // obtain response
        $jsonResponse = curl_exec($session);
-       curl_close($session);
-       
+       $http_code = curl_getinfo($session, CURLINFO_HTTP_CODE);
+       if ($http_code != 200) {
+           $this->lastResponseError = curl_error($session);
+       } else {
        $this->debugCall('DEBUG - Json Response: ' , $jsonResponse);
        
        $results  = json_decode ( $jsonResponse, TRUE );
@@ -128,6 +130,8 @@
        $this->debugCall('DEBUG - Results: ' , $results);
        
        $this->lastResponseError = isset($results['error']) ? $results['error'] : NULL;
+        }
+       curl_close($session);
 
        return $this->lastResponseError ? false : $results;
    }

Also please note that SG API has new URL.

PS: after these changes I finally found a reason why my stopped communicating with SG: "Problem with the SSL CA cert (path? access rights?)"