fixed a bug: in case if the environment does not support HTMLVideoElement.
fixed a bug: in case if the environment does not support HTMLVideoElement.

BeanSeed/phaser,TukekeSoft/phaser,spayton/phaser,BeanSeed/phaser,photonstorm/phaser,mahill/phaser,spayton/phaser,photonstorm/phaser,TukekeSoft/phaser,TukekeSoft/phaser,mahill/phaser