Width and height validations don't cover all possible values

[tonyfu511]

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Describe the bug
We received a production bug that the app crashed in LottieDrawable.

At https://github.com/airbnb/lottie-android/blob/master/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java#L1623, the code only check if (renderWidth == 0 || renderHeight == 0), and it should be changed to if (renderWidth <= 0 || renderHeight <= 0) to make sure covering all cases.

Steps To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error