anchor.diff:        } catch(e,st) {
           if(mime==MimeTypes.swf) {
             _log.warning("Error while genereting thumbnail of swf",e,st);
  +          item.errors.add("Error while genereting thumbnail of swf: ${e.toString()}");
           } else {
             rethrow;
           }
  
positive.code:     } else {
        throw new InvalidInputException("MIME type not supported: $mime");
      }
      item.height = originalImage.height;
      item.width = originalImage.width;
  
      if (MimeTypes.webFriendlyTypes.contains(mime)) {
        _log.fine("Web-friendly MIME type, using original file for display");
  
negative.code:       _log.warning("Error while generating thumbnail for ${item.id}", e, st);
        item.errors.add(
            "Error while generating thumbnail for ${item.id}: ${e.toString()}");
      }
      }
  
      return filesWritten;
  