upload: Not all builds have a tool directory, ignore failure

This is an intermediate band-aid for the 201705 branch and with some
more bash rules we can make this a function.

scripts/upload-build.sh

@@ -13,7 +13,7 @@ set -ex
 
 rsync --delete -avz tmp/deploy/ipk/	sysmocom-downloads:$1/$2/ipk
 rsync --delete -avz tmp/deploy/images/	sysmocom-downloads:$1/$2/images
-rsync --delete -avz tmp/deploy/tools/	sysmocom-downloads:$1/$2/tools
+rsync --delete -avz tmp/deploy/tools/	sysmocom-downloads:$1/$2/tools || true
 rsync --delete -avz tmp/deploy/sdk/	sysmocom-downloads:$1/$2/sdk
 rsync --delete -avz tmp/cache/		sysmocom-downloads:$1/$2/cache-state
 rsync --delete -avz cache/		sysmocom-downloads:$1/$2/cache