fix pngs better

inc/image.php

@@ -361,10 +361,10 @@ class ImageConvert extends ImageBase {
 					$this->width,
 					$this->height,
 					escapeshellarg($this->temp)))) || !file_exists($this->temp)) {
-                                //if (!preg_match ('/sBIT: invalid/', $error)) {
+				if (!file_exists($this->temp)) {
-				//	$this->destroy();
+					$this->destroy();
-				//	error(_('Failed to resize image!'), null, $error);
+					error(_('Failed to resize image!'), null, $error);
-				//}
+				}
 			}
 			if ($size = $this->get_size($this->temp)) {
 				$this->width = $size[0];