No way to get starting candidates on empty input

[unsupervisednn]

Without suppling input I would like to get valid candidates for completion. The current way with parser.collectCandidates(tokenIndex) requires that there be a token index which doesn't exist for the empty string.

[alessiostalla]

Can't you pass -1 as the token index?

[mike-lischke]

-1 will not work, but 0 should. There's always at least one token in the token stream (EOF).