Fix test failures by changing the failover mode to check for existince of needed variables rather than storing 'newGrid'

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1141 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Grid.js

@@ -219,12 +219,11 @@ OpenLayers.Layer.Grid.prototype =
     
         do {
             var row;
-
+            
-            if (newGrid) {
+            row = this.grid[rowidx++];
+            if (!row) {
                 row = new Array();
                 this.grid.push(row);
-            } else {
-                row = this.grid[rowidx++];
             }
 
             tileoffsetlon = startLon;
@@ -247,12 +246,12 @@ OpenLayers.Layer.Grid.prototype =
                 var px = new OpenLayers.Pixel(x, y);
                 var tile;
                 
-                if (newGrid) {                
+                tile = row[colidx++];
+                if (!tile) {
                     tile = this.addTile(tileBounds, px);
                     tile.draw();
                     row.push(tile);
                 } else {
-                    tile = row[colidx++];
                     tile.moveTo(tileBounds, px);
                 }