Fix file open dialog in mission planner

tabs/mission_control.js

@@ -354,8 +354,10 @@ TABS.mission_control.initialize = function (callback) {
             }
         });
         //reset text position
+        if (textGeom) {
             textGeom.setCoordinates(map.getCoordinateFromPixel([0,0]));
         }
+    }
 
     function paintLine(pos1, pos2) {
         var line = new ol.geom.LineString([pos1, pos2]);