replace processed_date retriveal

Author: squirrelo

qiita_pet/uimodules/processed_data_tab.py

@@ -53,7 +53,7 @@ def render(self, study_id, processed_data):
 
         pd_id = processed_data.id
         preprocessed_data_id = processed_data.preprocessed_data
-        process_date = processed_data.processed_date
+        process_date = processed_data.processing_info['processed_date']
         filepaths = processed_data.get_filepaths()
         is_local_request = self._is_local()