num groups in group vs collapse query

[Dmitri Maziuk]

Hi all,

a query with `group=true&group.field=Foo&group.ngroups=true` returns 
`"ngroups" : 8`. There are 7 "real" groups and one null group.

Same query with `fq={!collaps field=Foo nullPolicy=expand}` returns 
`"numFound" : 10`. There are 7 "real" groups and 3 null ones.

Is that supposed to happen?

(Using 8.11 single node)

Dima