Merge pull request #446 from phac-nml/empty_summaries

skip empty dataframes to avoid runtime error

june/records/records_writer.py

@@ -331,6 +331,11 @@ def combine_summaries(record_path, remove_left_overs=False, save_dir=None):
     dfs = []
     for summary_file in summary_files:
         df = pd.read_csv(summary_file)
+
+        #skip summary_file if df contains no rows
+        if len(df.index) == 0:
+            continue
+
         aggregator = {
             col: np.mean if "current" in col else sum for col in df.columns[2:]
         }