Compare not working with files without extension

[janusz-chludzinski-zz]

When in split mode (either one) and trying to compare files, nothing is happening. When I looked into console:

Uncaught TypeError: Cannot read property '1' of nullgetExtension @ main.js:75(anonymous function) @ main.js:111dispatch @ thirdparty.min.js:20r.handle @ thirdparty.min.js:20

So the problem seems to be with regex not allowing files without extension and to be honest quite often tmp files wont have extension. Would be great to fix that, thanks!