Fix hotfix for 1D mesh normals in cmesh.
Fix hotfix for 1D mesh normals in cmesh.

rc/sfepy,vlukes/sfepy,sfepy/sfepy,BubuLK/sfepy,BubuLK/sfepy,vlukes/sfepy,sfepy/sfepy,rc/sfepy,vlukes/sfepy,rc/sfepy,sfepy/sfepy,BubuLK/sfepy