Qt Quick and Active Qt are generating a module.html with empty bodies:
http://doc-snapshot.qt-project.org/qt5-dev/qtquick/module.html
http://doc-snapshot.qt-project.org/qt5-dev/activeqt/module.html

There doesn't seem to be an indication of why they are generated from which page.
Notes:

• there are no "\page module", "\example module", or "\group module" in both modules.
  -only happens in dev branch. These pages do not exist in 'stable' or 'release' branches
  -only those two modules generate the module.html

Can you give an insight where to look?

These files conflict with each other.