* Handle 0 when calling createTarget to avoid the crashes in the first place
* Do not try to create/add targets for 0 profiles to avoid creator writing
  a warning to the console
* Fix possible crashes in debugger when no default profile is set.

Task-number: QTCREATORBUG-7695
Change-Id: I9afc8e29c8b859ad078dad794ef5017168daac78
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>