Bugfix: let libvirt populate channel source
Bugfix: let libvirt populate channel source

Current behavior is to set the source path to empty string, which blocks the Guest Agent from working correctly.
deasmi/terraform-provider-libvirt,deasmi/terraform-provider-libvirt,dmacvicar/terraform-provider-libvirt,deasmi/terraform-provider-libvirt,dmacvicar/terraform-provider-libvirt,dmacvicar/terraform-provider-libvirt