add detail error to dataset

ppocr/data/simple_dataset.py

@@ -117,7 +117,7 @@ class SimpleDataSet(Dataset):
                 data['image'] = img
             data['ext_data'] = self.get_ext_data()
             outs = transform(data, self.ops)
-        except Exception as e:
+        except:
             error_meg = traceback.format_exc()
             self.logger.error(
                 "When parsing line {}, error happened with msg: {}".format(