Sioyek crashes when trying to open the wrong fileformat

[NandorKovacs]

Although this is clearly user error, it would be nice if sioyek didnt crash (and somehow forget my progress of that session for the open documents) when i accidentally open a .xopp document, but rather just threw an error pop up or something.

[ahrm]

I think this should be fixed in 627b1b7.

[NandorKovacs]

Thanks a lot, it does fix it!

The error "document does not exist" thrown now is inaccurate, but doesn't bother me personally at all. Feel free to close this.