special cased inRange() to return true if getResolution() returns null -- this way we get through and actually do load 3rd party layers.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1598 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/FixedZoomLevels.js

@@ -89,6 +89,26 @@ OpenLayers.Layer.FixedZoomLevels.prototype = {
         return resolution;
      },
     
+    /** Overridden from OpenLayers.Layer because if the 3rd party tool has 
+     *   not been loaded (setcentered) yet, then its translation function 
+     *   will return null and therefore resolution will be null. In this case
+     *   we want to return true so that the redraw will happen.
+     * 
+     * @returns Whether or not the layer is displayable at the current map's
+     *          current resolution
+     * @type Boolean
+     */
+    inRange: function() {
+        var inRange = false;
+        if (this.map) {
+            var resolution = this.map.getResolution();
+            inRange = ( (resolution == null) ||
+                        ( (resolution >= this.minResolution) &&
+                           (resolution <= this.maxResolution) ) );
+        }
+        return inRange;
+    },
+
     /** Calculates using px-> lonlat translation functions on tl and br 
      *   corners of viewport
      *