(svn r1573) -Fix: Station and depot building mode is now terminated if the

corresponding windows are closed [ 1104277 ]

airport_gui.c

@@ -203,6 +203,10 @@ static void BuildAirportPickerWndProc(Window *w, WindowEvent *e)
 
 		CheckRedrawStationCoverage(w);
 	} break;
+	
+	case WE_DESTROY:
+		ResetObjectToPlace();
+		break;
 	}
 }