if a containment's lastScreen is not -1 (and a valid screen)
*and* its activity() is not the current one, its QML
will *not* be loaded, therefore it would dangle blocking
corona::startupCompleted until the activity is selected
Change-Id: I6757d29240a012377e9ff0a22fe16541ea712ee6
Containments with no applets will emit uiReady now
It adds a test as well that checks if this is the case.
There is still a case where the corona doesn't emit startupCompleted()
that's when there is more than one activity, but that, as well the test
will be adressed by another patch on a different part.
Change-Id: I4d83aa612c29fb0f441d11681bc5aba241370bc3
