Update code from origin/master. Use ob_end_clean.

Upload.class.php

@@ -75,17 +75,17 @@ abstract class Upload
 	    ) {
 		    $script_file_path = Config::get('PYTHON_PIL_PASTE')->script_file_path;
 		    $pil_options = (isset(Config::get('PYTHON_PIL_PASTE')->pil_options) && Config::get('PYTHON_PIL_PASTE')->pil_options) ? ' ' . implode(' ', Config::get('PYTHON_PIL_PASTE')->pil_options) : '';
-//            ob_start();
+            ob_start();
             $code = null;
             $command = $script_file_path
                 . $pil_options
                 . ' ' . self::getFilePath($image_variant)
                 . ' ' . Config::get('PATH_WEB_ROOT') . '/' . $image->getWatermark($size);
-		    passthru($command, $code);
+		    passthru('exec 2>&1; ' . $command, $code);
             if ($code !== 0) {
-                throw new ErrorException('Command PYTHON_PIL_RESIZE: ' . $command );
+                throw new ErrorException('Command PYTHON_PIL_PASTE exit with code "' . $code . '": ' . $command . PHP_EOL . 'Std out: ' . ob_get_clean() );
             }
-//            ob_clean();
+            ob_end_clean();
 	    }
 	    self::defineSizeWidthAndHeight($image_variant);
         $image->variants[$size] = $image_variant;
@@ -134,7 +134,7 @@ abstract class Upload
 			    if ($code !== 0) {
 				    throw new ErrorException('Command PYTHON_PIL_RESIZE exit with code "' . $code . '": ' . $command . PHP_EOL . 'Std out: ' . ob_get_clean() );
 			    }
-			    ob_clean();
+			    ob_end_clean();
 		    } else {
 			    if ($width || $height) {
 				    if (!(ImageVariant::getIsClass($image)) && Image::getIsSubClass($image)) {