Avoid incorrectly updating osTicket disk checkbox

* Only update if disk tests are enabled and disk(s) were detected
* Addresses issue #40

.bin/Scripts/functions/hw_diags.py

@@ -1101,7 +1101,7 @@ def run_hw_tests(state):
   show_results(state)
 
   # Post disk results
-  if not state.ost.disabled:
+  if _disk_tests_enabled and state.disks and not state.ost.disabled:
     print_standard('Posting results to osTicket...')
     for disk in state.disks:
       state.ost.post_device_results(disk, state.ticket_id)