No debugger set up when starting with clean settings

Steps to reproduce:

• have a Qt and gcc stuff in PATH
• start Creator with clean settings (or with -settingspath and point to new directory)
• check the default kit that has been configured automatically

Current result:

• no debugger has been set up (which makes debugging out of the box not possible - you have to switch from "None" to "System GDB at /usr/bin/gdb"

Expected result:

• automatically set up default settings work like before