parser bug: internal head of fudge expression also as a dependant

Sentence: `a b c`
Annotation:

```
(a b*)
b > c
```

is failing (the error message in the online interface is `W('b')`; probably from an assertion somewhere). It should be legal for the starred head of a fudge expression, or any member of a fudge expression if none is starred, to have 1 explicit head.
