Restore_package_cache: Handle existing but empty packages directory

Author: rfinnie

functions/cache.sh

@@ -21,10 +21,10 @@ Restore_package_cache ()
 			if [ "$(stat --printf %d ${DIRECTORY}/)" = "$(stat --printf %d chroot/var/cache/apt/archives/)" ]
 			then
 				# with hardlinks
-				find "${DIRECTORY}" -name "*.deb" | xargs cp -fl -t chroot/var/cache/apt/archives
+				find "${DIRECTORY}" -name "*.deb" -print0 | xargs -0 --no-run-if-empty cp -fl -t chroot/var/cache/apt/archives
 			else
 				# without hardlinks
-				find "${DIRECTORY}" -name "*.deb" | xargs cp -t chroot/var/cache/apt/archives
+				find "${DIRECTORY}" -name "*.deb" -print0 | xargs -0 --no-run-if-empty cp -t chroot/var/cache/apt/archives
 			fi
 		fi
 	fi