Bugfix for the child contribution getter.
I would like this query not to return a row of nulls if there are no matches.

Change-Id: Ie85f172cd1f5840a17cab5988e40e18f7e72a5e3
Update drupal submodule

Change-Id: I20260d17021ad8a4327d36c27e536960586758bc
Merge remote-tracking branch 'origin/master' into HEAD

* Update drupal submodule

Change-Id: I2db90b29591b5988bb31af294a9681969e697e5a