[BUG] - Msys enters a loop when a BOp dependency is not declared

[homemmakako]

When a Bop A has another Bop B as its dependency but Bop B is not declared in the config, MSys just goes into a loop until it eventually breaks with a "Too much recursion" error.

We should check if bop dependencies exist beforehand to make sure this does not happen.

[zelcion]

Coming back to this. I think we already fixed this issue, will test later.