we should look into producing some sort of nice 404 error page with fancy dgidb branding and graphics down the road to make the app appeal more cohesive.
but for now, this PR makes an error message appear instead of a weirdly populated page with a bunch of "no data found" messages
this also fixes the footer hanging out randomly in the middle of some pages where the content doesn't take up the whole page. It will always be pushed to the bottom
we should look into producing some sort of nice 404 error page with fancy dgidb branding and graphics down the road to make the app appeal more cohesive.
but for now, this PR makes an error message appear instead of a weirdly populated page with a bunch of "no data found" messages
this also fixes the footer hanging out randomly in the middle of some pages where the content doesn't take up the whole page. It will always be pushed to the bottom
close #451