Cannot build a library .so file from QtCreator 3.4.0

I need to compile a simple project to generate an Android library (.so).

When I try to compile the project, I get the error:
09:49:20: Internal Error: Unknown Android deployment JSON file location.
Erreur lors de la compilation/déploiement du projet hello (kit : Android for armeabi-v7a (GCC 4.8, Qt 5.5.0))
When executing step "Build Android APK"

If I add an application to the project, then I'm able to compile my library. Looks like this version of QtCreator refuses to start a build if there is no app in the project. Version used by Qt5.2.1 used to be able to do that.