Merge branch 'summary_fix' of stefan.schmidt/ID2T-toolkit into master

code/Core/Statistics.py

@@ -1093,6 +1093,8 @@ class Statistics:
         print("\nNew database has been generated, printing statistics summary... ")
         total_packet_count = self.get_packet_count()
         pdu_count = self.process_db_query("SELECT SUM(pktCount) FROM unrecognized_pdus")
+        if pdu_count is None:
+            pdu_count = 0
         pdu_share = pdu_count / total_packet_count * 100
         last_pdu_timestamp = self.process_db_query(
             "SELECT MAX(timestampLastOccurrence) FROM unrecognized_pdus")