add logic for 0 ssms

methods/utilities.py

@@ -187,8 +187,14 @@ def get_ssm_frequency(
     for mut in mutation_list:
         print('mutation: {}'.format(mut))
         for ce in cancer_entities:
-            print('number of cases with mutation: {}'.format(
-                ssm_statistics[mut][ce]["ssm_counts"]))
+            try:
+                print('number of cases with mutation: {}'.format(
+                    ssm_statistics[mut][ce]["ssm_counts"]))
+            except Exception as e:
+                # if no ssms, this will be empty
+                print('number of cases with mutation: {}'.format(
+                    ssm_statistics
+                ))
             print('total case count: {}'.format(
                 total_case_count[ce]))