Finish 148-undefined-index-patch

Fix #147.

Author: mynetx

CHANGELOG

@@ -16,6 +16,7 @@ codebird-php - changelog
 + Support WebP media format
 + Fixes for non-multipart media uploads, see #141
 + Return rate-limiting info as object, when return format = object
+- #147 Undefined index when checking for possible media files
 
 2.7.2 (2015-09-23)
 - #135 Invalid HTTP request headers in non-cURL mode

src/codebird.php

@@ -1700,7 +1700,9 @@ protected function _getMultipartRequestFromParams($method_template, $border, $pa
    * @return mixed
    */
   protected function _checkForFiles($method_template, $key, $value) {
-    if (!in_array($key, self::$_possible_files[$method_template])) {
+    if (!array_key_exists($method_template, self::$_possible_files)
+      || !in_array($key, self::$_possible_files[$method_template])
+    ) {
       return false;
     }
     $data = $this->_buildBinaryBody($value);