RFE: Return 404 for not-found pastes

[danielshahaf]

Hi,

https://paste.debian.net/plain/819415 says "Entry not found" but returns HTTP code 200.

Could it return code 404 please? That would enable caste to display only a 404 error message rather than to dump the resultant HTML to stdout. (It should also be better for identifying links to expired pastes as dead links, etc..)

Thanks,