fix bsdiff creation for patches that don't contain bsdiff extra data #1421
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When a created bsdiff patch does not contain any extra data, a
System.DivideByZeroExceptionis thrown by SharpCompress when trying to compress the (zero-sized) extra data (as also reported in #1101 ).This fix skips writing and reading the extra data if there is none in the patch.
For us, this was also the cause of electron/windows-installer#185.