fix HDF5MeshIO.read_data() for files without shape data attribute
fix HDF5MeshIO.read_data() for files without shape data attribute

sfepy/sfepy,vlukes/sfepy,rc/sfepy,BubuLK/sfepy,sfepy/sfepy,BubuLK/sfepy,lokik/sfepy,rc/sfepy,vlukes/sfepy,RexFuzzle/sfepy,RexFuzzle/sfepy,RexFuzzle/sfepy,lokik/sfepy,RexFuzzle/sfepy,sfepy/sfepy,rc/sfepy,lokik/sfepy,lokik/sfepy,vlukes/sfepy,BubuLK/sfepy