Removed redundant assertion of imt in DEFINED_FOR_INTENSITY_MEASURE_TYPES; this is handled by base class.
Removed redundant assertion of imt in DEFINED_FOR_INTENSITY_MEASURE_TYPES; this is handled by base class.

rcgee/oq-hazardlib,rcgee/oq-hazardlib,gem/oq-hazardlib,gem/oq-engine,gem/oq-engine,gem/oq-hazardlib,vup1120/oq-hazardlib,gem/oq-engine,vup1120/oq-hazardlib,gem/oq-hazardlib,gem/oq-engine,gem/oq-engine,vup1120/oq-hazardlib