Update coverage.cpp
Update coverage.cpp

Commented out the effects of taking validation out of the parser

nickerso/libcellml,nickerso/libcellml,MichaelClerx/libcellml,hsorby/libcellml,cellml/libcellml,MichaelClerx/libcellml,cellml/libcellml,nickerso/libcellml,cellml/libcellml,nickerso/libcellml,hsorby/libcellml,hsorby/libcellml,hsorby/libcellml,MichaelClerx/libcellml,cellml/libcellml