Handle directories leading to minor/major changes also that wasn't represented in main yet

[Greewil]

Problem

If vuh trying to check git diff with directory (or file) that not represented in main branch yet 'git diff' command will throw an error.

Possible solution

Before checking git diff check if directory/file represented in main branch. If not represented in main branch, but exists in history locally, so consider that there is a git diff.