debmirror tries to fetch non-existing InRelease file for Trusty repos

debmirror tries to fetch InRelease file to mirror Trusty repos. However this file does not exist.

To reproduce
debmirror --no-source -a amd64 -s main -h archive.ubuntu.com -d trusty -r /ubuntu --nocleanup --progress /var/www/html/ubuntu

The only relevant parameter is -d trusty because it works with -d xenial.

It leads to the following errors
[..]
Getting meta files ...
[ 0%] Getting: dists/trusty/Release #
[ 0%] Getting: dists/trusty/InRelease # failed:Failed to open file.
[ 0%] Getting: dists/trusty/Release.gpg #
Ubuntu Release file: using Suite (trusty).
Use of uninitialized value $size in numeric eq (==) at /usr/bin/debmirror line 1645.
Use of uninitialized value $size in numeric eq (==) at /usr/bin/debmirror line 1645.
[...]

# lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04

# apt-cache policy debmirror
debmirror:
  Installed: 1:2.25ubuntu2
  Candidate: 1:2.25ubuntu2
  Version table:
 *** 1:2.25ubuntu2 500
        500 http://fr.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        100 /var/lib/dpkg/status