repository local metadata doesn't work ("No apps to process")

version of fdroid: master

What I did:

Trying to build an app from local metadata as documented here: https://f-droid.org/docs/Building_Applications/(second to last paragraph)

1. clone fdroiddata
2. fdroid build org.yaaic:13
3. cp metadata/org.yaaic.txt build/org.yaaic/.fdroid.txt
4. cd build/org.yaaic && fdroid build

What did I expect:

fdroid building the local copy of the app

What did I see:

INFO: Creating log directory
INFO: Creating temporary directory
INFO: Creating output directory
INFO: Creating build directory
CRITICAL: No apps to process.

Note: it's indeed picking up the .fdroid.txt file as locla metadata file but somehting later seems to go wrong.

CC: @eighthave