Qnx: Fixing IDE crash when removing activated manual BB NDK Target

Task-number: QTCREATORBUG-10595
Change-Id: Ia62048de5f49b74b163b796750a3726bb4f2d262
Reviewed-by: Fanda Vacek <fvacek@blackberry.com>
Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>
Reviewed-by: David Kaspar <dkaspar@blackberry.com>