0.4.8.1 - fixed a crash, occuring when a prevoiusly used texture is missing

It’s a small update, fixing a recently reported bug. I still plan to support the tool, if you find a bug, please report. I am still unable to build a Mac version in recent version of Godot, but if you happen to use one - just download the source code from https://github.com/aleksandrbazhin/TilePIpe and run it from Godot engine. I will start uploading Mac OS builds again when I find the solution. Overall direction of the project is - I am remaking it mostly from scratch, the UI looks like this https://github.com/aleksandrbazhin/TilePIpe/tree/new_project_logic(v.0.5). That will be TilePipe2, and the current project will remain as TilePipe. There are a lot of reasons to it, but the main is that the UI logic is too convoluted and complex currently, so to develop it further, the UI needed to be redone. I guess that is what happens with most project as the scope is growing.