Tidy up completed progress bars

probabilistic-analysis/probabilistic_assessment.py

@@ -588,6 +588,10 @@ def process(beach_name, beach_scenario, n_runs, start_year, end_year,
                     header=False,
                     float_format='%g')
 
+            pbar_year.close()
+        pbar_profile.close()
+    pbar_profiles.close()
+
 
 def main():