QmlDesigner: Build should not succeed if temp is unavailable

Change-Id: I6288fc085d8a55d16067f140516f4f83f822dd76
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Fix finish expression

Build process should exit normally AND exit with return value zero!

Change-Id: I5566acadea0cd2cfc805b4b3876dcb4fbbb4313b
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Fix message box

Use QmlDesignerWarning::show instead of own function.

Change-Id: I8e14761c7c5534a3f1d9a01250cce1fc2d43d666
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>