Fix bug in cloner transparency #1388
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If an image was cloned with cloneEmpty() and a fully transparent color for exampe "rgba(255, 255, 255, 0)" the turned out as white background. This patch sets the background color as fully transparent if it has an alpha channel value of 0 i.e. 100% transparent (clear).
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See #1389
If an image has been cloned with cloneEmpty() and a completely transparent color e.g. "rgba(255, 255, 255, 0)" was specified as the background, the end result is an opaque white, for certain image formats. Observed with GIF.
This patch sets the background color as fully transparent if it has an alpha channel value of 0, i.e. 100% transparent (clear).