Fix trigger when no one is around.

commands/wizards.py

@@ -238,11 +238,18 @@ class CmdGMTrigger(Command):
         element goes to 'dests' and the second goes to the room
         (based on the caller's location).
         """
+        target = None
         if len(self.send_to) > 0:
             target = self.send_to[0]
         else:
-            target = choice(self.caller.characters_here())
-        name = target.db._sdesc or target.key or ""
+            targets = self.caller.characters_here()
+            if targets:
+                target = choice(targets)
+
+        if target:
+            name = target.db._sdesc or target.key
+        else:
+            name = ''
 
         for idx, event in enumerate(events):
             if isinstance(event, str):