interrupting of unexising warp will message. Fixes #944

src/main/java/carpet/helpers/TickSpeed.java

@@ -108,10 +108,14 @@ public class TickSpeed
         {
             tick_warp_callback = null;
             if (source != tick_warp_sender) tick_warp_sender = null;
+            if (time_bias > 0)
+            {
                 finish_time_warp();
                 tick_warp_sender = null;
                 return Messenger.c("gi Warp interrupted");
             }
+            return Messenger.c("ri No warp in progress");
+        }
         if (time_bias > 0)
         {
             String who = "Another player";