Description of problem:
This could be an issue on more systems without the bluetooth HW, I can only see the issue on qemu VMs.

Version-Release number of selected component (if applicable):
bluedevil-2.1-1.el7.x86_64

How reproducible:
Run bluedevil-wizard:

➜ bluedevil-wizard                                    
QObject::connect: Cannot connect (null)::unpairedDeviceFound(Device*) to DiscoverPage::deviceFound(Device*)
Segmentation fault (core dumped)

In:

1 	QDBusAbstractInterface::asyncCallWithArgumentList(QString const&, QList<QVariant> const&)
2 	BlueDevil::Manager::registerAgent(QString const&, BlueDevil::Manager::RegisterCapability)
3 	WizardAgent::WizardAgent(QApplication*)
4 	BlueWizard::BlueWizard(KUrl const&)
5 	main 

The following FAF report contains full traceback as well as other details:
http://faf.lab.eng.brq.redhat.com/faf/problems/bthash/?bth=d023f30a542d94966996517f48bdac6296f3b035

HW: ➜ lspci -nn:
00:00.0 Host bridge [0600]: Intel Corporation 440FX - 82441FX PMC [Natoma] [8086:1237] (rev 02)
00:01.0 ISA bridge [0601]: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] [8086:7000]
00:01.1 IDE interface [0101]: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] [8086:7010]
00:01.2 USB controller [0c03]: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] [8086:7020] (rev 01)
00:01.3 Bridge [0680]: Intel Corporation 82371AB/EB/MB PIIX4 ACPI [8086:7113] (rev 03)
00:02.0 VGA compatible controller [0300]: Cirrus Logic GD 5446 [1013:00b8]
00:03.0 Ethernet controller [0200]: Red Hat, Inc Virtio network device [1af4:1000]
00:04.0 SCSI storage controller [0100]: Red Hat, Inc Virtio block device [1af4:1001]
00:05.0 RAM memory [0500]: Red Hat, Inc Virtio memory balloon [1af4:1002]
00:06.0 Audio device [0403]: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller [8086:2668] (rev 01)