dispatcher: tolerate lack of connection path

If the dispatcher is being invoked because the connection was removed
(e.g. device going down), it doesn't have a path or a filename anymore.
Don't abort in such cases.
17 jobs for lr/dispatcher-path in 57 minutes and 13 seconds (queued for 2 minutes and 48 seconds)
latest
Status Job ID Name Coverage
  Test
passed #422320
allowed to fail
checkpatch

00:01:51

manual #422325
allowed to fail manual
t_centos:7.5.1804
passed #422326
t_centos:7.6.1810

00:30:02

passed #422332
t_debian:10

00:14:16

passed #422331
t_debian:9

00:25:52

passed #422334
t_debian:sid

00:18:57

manual #422333
allowed to fail manual
t_debian:testing
passed #422321
t_fedora:28

00:30:25

passed #422322
t_fedora:29

00:30:26

passed #422323
t_fedora:30

00:26:11

manual #422324
allowed to fail manual
t_fedora:rawhide
passed #422327
t_ubuntu:16.04

00:22:51

passed #422328
t_ubuntu:18.04

00:14:39

manual #422330
allowed to fail manual
t_ubuntu:devel
manual #422329
allowed to fail manual
t_ubuntu:rolling
 
  External
failed NetworkManager test verification

failed NetworkManager test verification

06:41:58