Fix undefined 'quadDetails' Error

CHANGES.md

@@ -15,6 +15,7 @@ Change Log
 * Fixed 3D tiles style coloring when multiple tilesets are in the scene [#8051](https://github.com/AnalyticalGraphicsInc/cesium/pull/8051)
 * Improved display of tile coordinates for `TileCoordinatesImageryProvider` [#8131](https://github.com/AnalyticalGraphicsInc/cesium/pull/8131)
 * Fixed relative-to-center check, `depthFailAppearance` resource freeing for `Primitive` [#8044](https://github.com/AnalyticalGraphicsInc/cesium/pull/8044)
+* Fixed undefined `quadDetails` error from zooming into the map really close. [#8011](https://github.com/AnalyticalGraphicsInc/cesium/pull/8011)
 
 ### 1.61 - 2019-09-03
 

CONTRIBUTORS.md

@@ -108,7 +108,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to contribute to Cesiu
   * [Yonatan Kra](https://github.com/yonatankra)
 * [Novetta](http://www.novetta.com/)
    * [Joshua Bernstein](https://github.com/jbernstein/)
-   * [Natanael Rivera](https://github.com/nrivera-Novetta/)
+   * [Natanael Rivera](https://github.com/njrivera/)
    * [Justin Burr](https://github.com/jburr-nc/)
    * [Jeremy Marzano](https://github.com/JeremyMarzano-ISPA/)
 * [Orbit Logic](http://www.orbitlogic.com)

Source/Scene/QuadtreePrimitive.js

@@ -655,7 +655,7 @@ define([
         result.notYetRenderableCount = southwest.notYetRenderableCount + southeast.notYetRenderableCount + northwest.notYetRenderableCount + northeast.notYetRenderableCount;
     };
 
-    var traversalQuadsByLevel = new Array(30); // level 30 tiles are ~2cm wide at the equator, should be good enough.
+    var traversalQuadsByLevel = new Array(31); // level 30 tiles are ~2cm wide at the equator, should be good enough.
     for (var i = 0; i < traversalQuadsByLevel.length; ++i) {
         traversalQuadsByLevel[i] = new TraversalQuadDetails();
     }