Skip empty dataframes when processing multiple basins

waternsw_grabber/waternsw_grabber.py

@@ -506,6 +506,10 @@ def extract_records(input_dir, output_dir, clean_up=False):
 
     for basin_code in basin_codes:
         for period in periods:
+            # Ignore empty dataframes
+            if len(master[basin_code][period]) == 0:
+                continue
+
             # Get latest date from dataframe
             latest_date = master[basin_code][period].index[-1].strftime(
                 '%Y-%m-%d')