[DRE-maint] Bug#1101997: RM: ruby-premailer-rails -- ROM; rc buggy, originaly packaged for gitlab, rubygems dependency is not optional in gitlab

[Pirate Praveen]

Package: ftp.debian.org
Severity: normal
X-Debbugs-Cc: ruby-premailer-rails at packages.debian.org, praveen at debian.org
Control: affects -1 + src:ruby-premailer-rails
User: ftp.debian.org at packages.debian.org
Usertags: remove

Affected by https://bugs.debian.org/1093925

Originally packaged for gitlab, but now gitlab dropped strict dependency on
rubygem packages, so we package dependencies only if it is also useful outside
gitlab.