#463 warning on null description

#463

Author: JamesHeinrich

getid3/write.metaflac.php

@@ -71,7 +71,7 @@ public function WriteMetaFLAC() {
 					$picture_typeid = (!empty($picturedetails['picturetypeid']) ? $this->ID3v2toFLACpictureTypes($picturedetails['picturetypeid']) : 3); // default to "3:Cover (front)"
 					$picture_mimetype = (!empty($picturedetails['mime']) ? $picturedetails['mime'] : ''); // should be auto-detected
 					$picture_width_height_depth = '';
-					$this->pictures[] = $picture_typeid.'|'.$picture_mimetype.'|'.preg_replace('#[^\x20-\x7B\x7D-\x7F]#', '', $picturedetails['description']).'|'.$picture_width_height_depth.'|'.$temppicturefilename;
+					$this->pictures[] = $picture_typeid.'|'.$picture_mimetype.'|'.preg_replace('#[^\x20-\x7B\x7D-\x7F]#', '', (string) $picturedetails['description']).'|'.$picture_width_height_depth.'|'.$temppicturefilename;
 				} else {
 					$this->errors[] = 'failed to open temporary tags file, tags not written - fopen("'.$temppicturefilename.'", "wb")';
 					return false;