"Install on device" button silently doesn't work if a wrong-arch kit is selected

[Stuart Langridge]

If your project does not have an armhf kit added in the Projects pane, or if it does have that kit but that kit isn't selected as the target kit to build, then clicking "Install on device" in the Publish pane will build but not install, and it won't indicate that it didn't install nor why that happened. Perhaps some suitable error message could be shown, or better just Do The Right Thing and use the armhf kit if there is one (and explain about adding one if there isn't).