Applied patch from Erwan Le Gall <elegall@linagora.com> to give a warning when installing local packages with wrong naming scheme.

docs/CREDITS

@@ -9,6 +9,7 @@ Patches (alphabetical order):
   * Chris Lamb <chris@chris-lamb.co.uk>
   * Cyril Brulebois <cyril.brulebois@kerlabs.com>
   * David Madore <david.madore@ens.fr>
+  * Erwan Le Gall <elegall@linagora.com>
   * Fathi Boudra <fabo@debian.org>
   * Franklin Piat <fpiat@bigfoot.com>
   * Frederic Lehobey <Frederic.Lehobey@free.fr>

helpers/lh_chroot_local-packages

@@ -60,7 +60,13 @@ then
 
 	# Installing packages
         Chroot "find /root -name *.deb" > chroot/root/local-packages
-	Chroot "xargs --arg-file=/root/local-packages dpkg -i" || true
+
+	if [ -s chroot/root/local-packages ]
+	then
+		Chroot "xargs --arg-file=/root/local-packages dpkg -i" || true
+	else
+		Echo_warning "Local packages must be named with suffix '_all.deb' or '_\$architecture.deb'."
+	fi
 
 	# Cleaning dependencies
 	Apt install -f