[fs2zammad] do not crash on failed ticket import

fs2zammad

@@ -110,28 +110,7 @@ def maybe_create_zammad_user(userdata, zammad_session, attr="login", default=Non
 #             id, {"roles": roles.append("Agent")}
 #         )
 
-### main logic ###
-
-if not os.path.exists("rt2zammad.json"):
-    print("Missing rt2zammad.json!")
-    print("Create one based on following template:")
-    print(TEMPLATE)
-    sys.exit(1)
-
-with open("rt2zammad.json") as handle:
-    config = json.load(handle)
-
-h2t = html2text.HTML2Text()
-zammad = get_zammad_session()
-
-os.makedirs("users", exist_ok=True)
-os.makedirs("tickets", exist_ok=True)
-os.makedirs("attachments", exist_ok=True)
-
-ticket_ids = os.listdir("tickets/")
-print(f"Found {len(ticket_ids)} tickets on filesystem.")
-
-for id in ticket_ids:
+def create_zammad_ticket(id, zammad, h2t):
     with open(f"tickets/{id}", "rb") as handle:
         rt_ticket = pickle.load(handle)
 
@@ -186,7 +165,7 @@ for id in ticket_ids:
 
     # Ignore comments for merged tickets.
     if merged:
-        continue
+        return
 
     # Internal note regarding the RT-Zammad import.
     TicketArticle(zammad).create(
@@ -258,3 +237,37 @@ for id in ticket_ids:
 
         if restore_creator_to != None:
             zammad.ticket.update(zammad_ticket["id"], {"customer_id": restore_creator_to})
+
+### main logic ###
+
+if not os.path.exists("rt2zammad.json"):
+    print("Missing rt2zammad.json!")
+    print("Create one based on following template:")
+    print(TEMPLATE)
+    sys.exit(1)
+
+with open("rt2zammad.json") as handle:
+    config = json.load(handle)
+
+h2t = html2text.HTML2Text()
+zammad = get_zammad_session()
+
+os.makedirs("users", exist_ok=True)
+os.makedirs("tickets", exist_ok=True)
+os.makedirs("attachments", exist_ok=True)
+os.makedirs("failed", exist_ok=True)
+
+ticket_ids = os.listdir("tickets/")
+print(f"Found {len(ticket_ids)} tickets on filesystem.")
+
+for id in ticket_ids:
+    try:
+        create_zammad_ticket(id, zammad, h2t)
+    except KeyboardInterrupt:
+        print("Received keyboard interrupt. Exiting.")
+        sys.exit()
+    except:
+        print(f"Failed to import RT#{id}")
+        dumpfile = f"failed/{id}"
+        with open(dumpfile, "wb") as handle:
+            pickle.dump(id, handle)