ProjectManager: No executable after building when using qmake based project

Steps to reproduce:

• create a simple Qt application from template (shouldn't matter which - tried Widget App & Console App) - but use qmake as build system
• hit Run Button (or if automatic build before run is disabled, hit Build before..)

Current result:

• message box comes up which asks for an executable and/or arguments
• when checking Projects view (Run settings) there's only a "Custom Executable" configured with empty executable, empty arguments and default build directory

Note: This works when using Qbs or CMake as build system.