Sprite::setScaleY: fix a potential crash on iOS#20680

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BodbDearg wants to merge 1 commit intococos2d:v4from

BodbDearg:bugfix/fix-sprite-setscaley-crash

Commits on Aug 5, 2021

Sprite::setScaleY: fix a potential crash on iOS if the sprite has no texture assigned. Need to add a null check for a bit of Metal specific code.
BodbDearg
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