Fix Fatal error: Division by zero in remainder operation

[MussaCharles]

This fixes Thread 1: Fatal error: Division by zero in remainder operation when for some reasons prepare() method is called with zero contentWidth.

I was working on my custom fork where the collectionView should automatically calculate its size based on the Intrinsic content size. Then After awhile I was greeted by the mentioned error. Refer to the screenshot below.

I fixed the issue by preventing further calculations unless the columnsCount is greater than zero.
So I thought it will be a great addition if it doesn't break any of your calculations. (So far it doesn't break anything based on my use case).

[VadzimMarozau]

There are few other places where division by zero is possible. All these places will be checked and fixed at one of the next versions of the app.