when looking for standards version dynamically, it should make sure the query succeeded

[pravi]

110 does not check if the rmadison command failed and this result in,

Standards-Version: curl: (6) Could not resolve host: api.ftp-master.debian.org
Problem with SSL CACERT check:
 Have you installed the ca-certificates package?

in control. If the query failed, it should fall back to the standards version in templates.

@stultus