Return a 404 error when no dstat csv can be loaded
Return a 404 error when no dstat csv can be loaded

openstack/stackviz,timothyb89/stackviz-ng,timothyb89/stackviz,openstack/stackviz,dklyle/stackviz-ng,timothyb89/stackviz,timothyb89/stackviz,dklyle/stackviz-ng,timothyb89/stackviz-ng,timothyb89/stackviz-ng,openstack/stackviz