[sailfish-browser] Pass url from dbus interface to qml to let browser to raise window. Contributes to JB#6637
[sailfish-browser] Pass url from dbus interface to qml to let browser to raise window. Contributes to JB#6637

Empty url needs to be handled as well. When browser launched from
application grid there is always an empty url. Empty url raises
window to foreground.

alinelena/sailfish-browser,sailfishos/sailfish-browser,rojkov/sailfish-browser,sailfishos/sailfish-browser,rojkov/sailfish-browser,alinelena/sailfish-browser,rojkov/sailfish-browser,alinelena/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser,alinelena/sailfish-browser