Fix cartographicLimitRectangle default and doc

Apps/Sandcastle/gallery/Cartographic Limit Rectangle.html

@@ -59,7 +59,7 @@
     if (checked) {
         viewer.scene.globe.cartographicLimitRectangle = coffeeBeltRectangle;
     } else {
-        viewer.scene.globe.cartographicLimitRectangle = Cesium.Rectangle.MAX_VALUE;
+        viewer.scene.globe.cartographicLimitRectangle = undefined;
     }
 });
 

CHANGES.md

@@ -23,6 +23,7 @@ Change Log
 * Fix rectangle positions at the north and south poles. [#7451](https://github.com/AnalyticalGraphicsInc/cesium/pull/7451)
 * Fixed image size issue when using multiple particle systems. [#7412](https://github.com/AnalyticalGraphicsInc/cesium/pull/7412)
 * Fixed Sandcastle's "Open in New Window" button not displaying imagery due to blob URI limitations. [#7250](https://github.com/AnalyticalGraphicsInc/cesium/pull/7250)
+* Fixed an issue where setting `scene.globe.cartographicLimitRectangle` to `undefined` would cause a crash. [#7477](https://github.com/AnalyticalGraphicsInc/cesium/issues/7477)
 
 ### 1.53 - 2019-01-02
 

Source/Scene/Globe.js

@@ -329,11 +329,22 @@ define([
                 this._surface.tileProvider.clippingPlanes = value;
             }
         },
+        /**
+         * A property specifying a {@link Rectangle} used to limit globe rendering to a cartographic area.
+         * Defaults to the maximum extent of cartographic coordinates.
+         *
+         * @member Globe.prototype
+         * @type {Rectangle}
+         * @default Rectangle.MAX_VALUE
+         */
         cartographicLimitRectangle : {
             get : function() {
                 return this._surface.tileProvider.cartographicLimitRectangle;
             },
             set : function(value) {
+                if (!defined(value)) {
+                    value = Rectangle.clone(Rectangle.MAX_VALUE);
+                }
                 this._surface.tileProvider.cartographicLimitRectangle = value;
             }
         },

Specs/Scene/GlobeSurfaceTileProviderSpec.js

@@ -989,6 +989,11 @@ defineSuite([
             });
     });
 
+    it('cartographicLimitRectangle defaults to Rectangle.MAX_VALUE', function() {
+        scene.globe.cartographicLimitRectangle = undefined;
+        expect(scene.globe.cartographicLimitRectangle.equals(Rectangle.MAX_VALUE)).toBe(true);
+    });
+
     it('cartographicLimitRectangle culls tiles outside the region', function() {
         switchViewMode(SceneMode.COLUMBUS_VIEW, new GeographicProjection(Ellipsoid.WGS84));
          var unculledCommandCount;