Prevent then() from getting called after ObservablePromise is disposed
Prevent then() from getting called after ObservablePromise is disposed


Former-commit-id: dc9d441af761119a4986db3d1e7c376dd6c4cb6d
cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend