Couple small fixes to filter parsing and api usage
Couple small fixes to filter parsing and api usage

1. reworked so that it doesn't use a (potentially) private
   member variable of the Conjunction class.
2. fixed a bug when parsing the uri fragment where it ends
   in a '/' and therefore an empty filter string.

informatics-isi-edu/chaise,informatics-isi-edu/chaise,informatics-isi-edu/chaise,informatics-isi-edu/chaise