rocon_app_manager: adds check for not installed apps (fixes #151)
Merge branch 'hydro-devel' of https://github.com/robotics-in-concert/rocon_app_platform into hydro-devel
rocon_app_manager: replace try with if
Merge pull request #152 from robotics-in-concert/invalid_installed_app

rocon_app_manager: adds check for not installed apps (fixes #151)