ArgumentPart suggestions

[pixeldev]

Well, I think there's a issue with part suggestions in sub-commands, if we have a empty parent sub-command then the next argument position wouldn't be suggested correctly.

There is an example, as you can see we have a empty parent with a custom part called 'Bank'. Suggestions of that part aren't being suggested, but this issue only occurs with the empty parent.

[FixedDev]

It isn't related with the actual parts, the problem is with the FirstMatchPart.