[fix] Only disable unused nics if the array is not empty

setup/so-functions

@@ -514,6 +514,7 @@ disable_onion_user() {
 }
 
 disable_misc_network_features() {
+	if [ ${#filtered_nics[@]} -ne 0 ]; then
 		for unused_nic in "${filtered_nics[@]}"; do
 			# Disable DHCPv4/v6 and autoconnect
 			nmcli con mod "$unused_nic" \
@@ -524,6 +525,7 @@ disable_misc_network_features() {
 			# Flush any existing IPs
 			ip addr flush "$unused_nic" >> "$setup_log" 2>&1
 		done
+	fi
 	# Disable IPv6
 	{ 
 		echo "net.ipv6.conf.all.disable_ipv6 = 1"