Fix RLE decompress with bitstring >= 4.1.0

[Daft-Freak]

Relevant part from bitstring release notes:

Only empty bitstring are now considered false in a boolean sense. Previously s was False if no bits in s were set to 1, but this goes against what it means to be a container in Python, so I consider this to be a bug, even if it was documented. I'm guessing it's related to nonzero in Python 2 becoming bool in Python 3, and it's never been fixed before now.

This was breaking image encoding as well as it seems a decompress happens at some point.

Also change the test to use some real data. (It wasn't failing as the data was all the same, so all enceded as runs)

[coveralls]

Pull Request Test Coverage Report for Build 9112910058

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.102%

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Totals
Change from base Build 5003532834:	0.0%
Covered Lines:	1270
Relevant Lines:	1475

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💛 - Coveralls

[Daft-Freak]

So, I just checked and this suggests that any new installs since last August are broken...

[Gadgetoid]

Woof. I guess it would be a good idea to expedite a new tools release!

[Gadgetoid]

Oh gosh as a maintainer is it now my duty to check that no_image.raw doesn't somehow unpack into an install time remote access trojan? 😆

[Daft-Freak]

Should be the same as the png but raw paletted, unless I messed up and made accidental malware. 🤷

Yeah, releasing this would be good, think I just missed hitting this the last time I reinstalled. (Not sure if that was lucky or not 🤔 )