Fix crazy bugs when entitypool is not used, but an entity class has a `pool` property.
Fix crazy bugs when entitypool is not used, but an entity class has a `pool` property.

rlugojr/melonJS,srbala/melonJS,melonjs/melonJS,MarkoIvanetic/melonJS,gopalindians/melonJS,gopalindians/melonJS,Smoss/Enoru-eco,MarkoIvanetic/melonJS,TukekeSoft/melonJS,rlugojr/melonJS,TukekeSoft/melonJS,melonjs/melonJS,Smoss/Enoru-eco,gopalindians/melonJS,rlugojr/melonJS,srbala/melonJS,TukekeSoft/melonJS,srbala/melonJS