when the width or height are 0 triggers a throw

[Bengreen]

When I am using this (inside leaflet.heat) I am getting an error thrown as due to the lifecycle of objects, but initial canvas is created with size 0,0 so throwing an error with the getImageData functions.
Is it possible to put guards around these to do something without a throw if the width or height are 0.

[Bengreen]

This is solved by #34