Fix entity show issues #7048

Author: cleroux

CHANGES.md

@@ -17,6 +17,7 @@ Change Log
 * Fixed an issue in the 3D Tiles traversal where empty tiles would be selected instead of their nearest loaded ancestors. [#7011](https://github.com/AnalyticalGraphicsInc/cesium/pull/7011)
 * Fixed an issue where scaling near zero with an model animation could cause rendering to stop. [#6954](https://github.com/AnalyticalGraphicsInc/cesium/pull/6954)
 * Fixed bug where credits weren't displaying correctly if more than one viewer was initialized [#6965](expect(https://github.com/AnalyticalGraphicsInc/cesium/issues/6965)
+* Fixed entity show issues[#7048](https://github.com/AnalyticalGraphicsInc/cesium/issues/7048)
 
 ### 1.49 - 2018-09-04