Show error if ticket not found

* Fixes issue #80

.bin/Scripts/functions/osticket.py

@@ -454,13 +454,17 @@ class osTicket():
       if not re.match(r'^(\d+)$', _input):
         continue
 
-      # Valid ID entered, lookup name and verify
+      # Valid ID entered, lookup name
       try:
         _name = self.get_ticket_name(_input)
       except Exception:
         # Ignore and return None below
         break
-      if _name:
+
+      # Verify
+      if _name is None:
+        print_error('ERROR: Ticket {} not found.'.format(_input))
+      elif _name:
         print_standard('You have selected ticket #{} {}'.format(
           _input, _name))
         if ask('Is this correct?'):