gem/oq-hazardlib — pull request #168 by micheles (2014-02-26 10:31:28+00:00)
Title: Expand the result of calc.gmf.ground_motion_fields only if a nontrivial filtering function is passed

This allows a simplification on the engine side. It can enter only with the companion pull request https://github.com/gem/oq-engine/pull/1376