Merge branch 'pota-corner-case' into 'master'

Fix corner case of POTA where not spotted, schedule but out of window

See merge request gridtracker.org/gridtracker!234

If this is changing anything in the UI or operational behavior, please prepare to update the wiki!

package.nw/lib/gt.js

@@ -7198,7 +7198,14 @@ function handleWsjtxDecode(newMessage)
             }
           }
         }
-        potaSpotFromDecode(callsign);
+        if (callsign.pota.length > 0)
+        {
+          potaSpotFromDecode(callsign);
+        }
+        else if (CQ == true && msgDXcallsign == "CQ POTA")
+        {
+          callsign.pota = ["?-????"];
+        }
       }
       else if (CQ == true && msgDXcallsign == "CQ POTA")
       {