Explicitly check that we know who the parent is before removing child from parent. r=crschmidt (closes #1316)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5973 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Map.js

@@ -1000,7 +1000,7 @@ OpenLayers.Map = OpenLayers.Class({
     removeControl: function (control) {
         //make sure control is non-null and actually part of our map
         if ( (control) && (control == this.getControl(control.id)) ) {
-            if (!control.outsideViewport && control.div) {
+            if (control.div && (control.div.parentNode == this.viewPortDiv)) {
                 this.viewPortDiv.removeChild(control.div);
             }
             OpenLayers.Util.removeItem(this.controls, control);