add test for invalid import parsing
add test for invalid import parsing

nickerso/libcellml,cellml/libcellml,MichaelClerx/libcellml,libcellml/buildbot-testing,cellml/libcellml,cellml/libcellml,hsorby/libcellml,nickerso/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,MichaelClerx/libcellml,hsorby/libcellml,MichaelClerx/libcellml,hsorby/libcellml,nickerso/libcellml,libcellml/buildbot-testing