Fix NPE a Bitmap reference at the Utils.resizeBitmapIfNeeded

[yunyh]

Occur NPE in the Utils.resizeBitmapIfNeeded if referenced Bitmap is null object.

Code modify similar way ImageAssetManager.bitmapForId method (line 138~148)

java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
        at com.airbnb.lottie.utils.Utils.resizeBitmapIfNeeded(Utils:284)
        at com.airbnb.lottie.manager.ImageAssetManager.bitmapForId(ImageAssetManager:110)
        at com.airbnb.lottie.LottieDrawable.getBitmapForId(LottieDrawable:1564)
        at com.airbnb.lottie.model.layer.ImageLayer.getBitmap(ImageLayer:125)
        at com.airbnb.lottie.model.layer.ImageLayer.drawLayer(ImageLayer:49)
        at com.airbnb.lottie.model.layer.BaseLayer.draw(BaseLayer:270)
        at com.airbnb.lottie.model.layer.CompositionLayer.drawLayer(CompositionLayer:161)
        at com.airbnb.lottie.model.layer.BaseLayer.draw(BaseLayer:270)
        at com.airbnb.lottie.LottieDrawable.drawDirectlyToCanvas(LottieDrawable:1751)
        at com.airbnb.lottie.LottieDrawable.draw(LottieDrawable:758)
        at android.widget.ImageView.onDraw(ImageView.java:1446)

And added null check everywhere use Utils.resizeBitmapIfNeeded

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