[PATCH manager 5/7] network-interface-pinning: avoid warning if `bond-primary` is unset

[Christoph Heiss <c.heiss@proxmox.com>]

Results in warnings such as

Use of uninitialized value $iface_name in pattern match (m//) at ..
Use of uninitialized value $iface_name in hash element at ..

`bond-primary` is an optional property and thus may be unset.

Signed-off-by: Christoph Heiss <c.heiss@proxmox.com>
---
 PVE/CLI/pve_network_interface_pinning.pm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/PVE/CLI/pve_network_interface_pinning.pm b/PVE/CLI/pve_network_interface_pinning.pm
index 9dff181dc..19e358cd9 100644
--- a/PVE/CLI/pve_network_interface_pinning.pm
+++ b/PVE/CLI/pve_network_interface_pinning.pm
@@ -95,7 +95,8 @@ my sub update_etc_network_interfaces {
                 $iface_name = $mapping->name($iface_name);
                 $iface->{'vlan-raw-device'} = $mapping->name($iface->{'vlan-raw-device'});
             } elsif ($iface->{type} eq 'bond') {
-                $iface->{'bond-primary'} = $mapping->name($iface->{'bond-primary'});
+                $iface->{'bond-primary'} = $mapping->name($iface->{'bond-primary'})
+                    if defined($iface->{'bond-primary'});
                 $iface->{slaves} = $mapping->list($iface->{slaves});
             } elsif ($iface->{type} eq 'bridge') {
                 $iface->{bridge_ports} = $mapping->list($iface->{bridge_ports});
-- 
2.54.0