GIF Writer is supposed to throw an IllegalStateException when calling prepareWriteSequence() without setting the output for the GIF Writer. But current implementation of GIF Writer ignores this check and does not do anything when output is null.

This is reproducible on Mustang-b39 on all platforms. Not reproducible for PNG, JPG and BMP writers.

I have attached a sample test. Execute the sample test. If you don't see any exception on the console, the bug is reproduced.
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