T1277: [dhcp-server] bugfix 'show dhcp server leases'
The script did not check if the service was actually configured or not.
This caused a FileNotFoundError for unconfigured services.
vyos@vyos:~$ show dhcp server leases
Traceback (most recent call last):
File "/usr/libexec/vyos/op_mode/show_dhcp.py", line 123, in <module>
leases = get_leases(lease_file, state='active')
File "/usr/libexec/vyos/op_mode/show_dhcp.py", line 60, in get_leases
leases = IscDhcpLeases(lease_file).get()
File "/usr/lib/python3/dist-packages/isc_dhcp_leases/iscdhcpleases.py", line 110, in get
with open(self.filename) as lease_file:
FileNotFoundError: [Errno 2] No such file or directory: '/config/dhcpd.leases'