PhysicalPath of IFileInfo can be null causing exception

[xperiandri]

https://github.com/ligershark/WebOptimizer/blob/32708323bd53836b4a43837b0f8b80673c9db736/src/WebOptimizer.Core/Processors/CssFingerprinter.cs#L61

If dir is null on this line Exception occurs that breaks all SCSS compilation

[xperiandri]

Maybe it must work like this? var info = new FileInfo(dir == null ? pathOnly : Path.Combine(dir, pathOnly.TrimStart('/')));