Suggestion: Dependencies throw an error if there is a missing world.

[Louw123]

I was having an error trying to figure out why the tree and info is not loading (#270) Turns out, I accidentally mistyped the name of the world. Here's the suggestion:

Lets say we have two worlds World1 and world2

Dependency World1 → World2

If someone mistyped and/or lean cannot find the world, it must throw an error at compile time:

Dependency World1 connects to a Unknown world.