Fixed a bug when there is multiple network cards but not all have IP (hestiacp#4728)

If a NIC didn't have an IP it would have added a trailing space
breaking multiple configs and future attempts to IP updates.

Co-authored-by: Jarkko Toivanen <jt@jakest.us>

Author: Laurennus

bin/v-update-sys-ip

@@ -48,6 +48,9 @@ for nic in $nics; do
 	if [ -z "$ips" ]; then
 		ips="$nic_ipv4s"
 	else
+		if [ -z "$nic_ipv4s" ]; then
+			break
+		fi
 		ips="$ips $nic_ipv4s"
 	fi
 done