Add loader to mutations tab which surprisingly wasnt there
Add loader to mutations tab which surprisingly wasnt there

Signed-off-by: Adam Abeshouse <abeshoua@mskcc.org>

Former-commit-id: 45c4df1e1bfd4c6ab9c6c9ebfc5cba91ab4ee49c
cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend