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 Hi there! Have same problem when try to parse binary files: so some of files could return null during readString and after that runtime error it will...

[skeleton.zip](https://github.com/pixijs/spine/files/9795101/skeleton.zip) so steps to reproduce is just to create emty project in spine(i used latest 4.1.14) and export as binary (you can use attached one) and it will throw error...

@ivanpopelyshev pls review/comment/fixUsingOwnWay https://github.com/pixijs/spine/pull/468 , thanks)

there is another issue #415 about that and pull request #468 to fix it, but no reaction from maintainers so far