Skip the directory under "contracts" without Cargo.toml

[h4x3rotab]

Now if there's an empty directory under contracts/, devphase will raise an error:

[06:30:59] Compilation [started]
ERROR: Loading Cargo.toml

Caused by:
    No such file or directory (os error 2)

It would be nice if it can automatically skip the non-rust directory.

Background: This is useful when I'm working on a git managed project. I may switch from a newer commit to an older commit, but the source code I added in the newer commit is deleted in the working tree while there are still a few files left inside (e.g. .env file with some API keys). I want to finish the work on the old commit, and switch back to then new commit later. In this case, I have a directory left under contracts/ without the real source code, but I would like to keep it.

[100k]

Absolutetly right. Fixed v0.6.2

[h4x3rotab]

Nice!