remove the float type "f" postfix in /simple_shadow.frag
Merge pull request #184 from tangziwen/v3

remove the float type "f" postfix in /simple_shadow.frag
do not try to load empty texture
Merge branch 'v3' of https://github.com/super626/cocos2d-x into v3
Merge pull request #9595 from super626/v3

Do not try to load empty texture