clearMask(true) would throw an exception if the Game Object didn't have a mask. Now it checks first before destroying the mask. Fix phaserjs#3809

Author: photonstorm

CHANGELOG.md

@@ -124,12 +124,13 @@ There is a new Game Object Component called `TextureCrop`. It replaces the Textu
 * Added the Mask component to Container. It worked without it, but this brings it in-line with the documentation and other Game Objects. Fix #3797 (thanks @zilbuz)
 * The DataManager couldn't redefine previously removed properties. Fix #3803 (thanks @AleBles @oo7ph)
 * The Canvas DrawImage function has been recoded entirely so it now correctly supports parent matrix and camera matrix calculations. This fixes an issue where children inside Containers would lose their rotation, and other issues, when in the Canvas Renderer. Fix #3728 (thanks @samid737)
+* `clearMask(true)` would throw an exception if the Game Object didn't have a mask. Now it checks first before destroying the mask. Fix #3809 (thanks @NokFrt)
 
 ### Examples, Documentation and TypeScript
 
 My thanks to the following for helping with the Phaser 3 Examples, Docs and TypeScript definitions, either by reporting errors, fixing them or helping author the docs:
 
-@DannyT @squilibob @dvdbrink @t1gu1 @cyantree @DrevanTonder @mikewesthad
+@DannyT @squilibob @dvdbrink @t1gu1 @cyantree @DrevanTonder @mikewesthad @tarsupin
 
 Also, a special mention to @andygroff for his excellent work enhancing the search box on the examples site, and @hexus for his assistance completing the documentation for the Game Objects.
 

src/gameobjects/components/Mask.js

@@ -63,7 +63,7 @@ var Mask = {
     {
         if (destroyMask === undefined) { destroyMask = false; }
 
-        if (destroyMask)
+        if (destroyMask && this.mask)
         {
             this.mask.destroy();
         }