batman-adv: Don't try to set unconfigured ap_isolation for vlan

The ap_isolation setting only supports boolean values. So setting an empty
string as ap_isolation is not supported by batctl.

Fixes: f5205d7d ("batman-adv: upgrade package to latest release 2014.2.0")
Signed-off-by: NSven Eckelmann <sven@narfation.org>

batman-adv/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=batman-adv
 
 PKG_VERSION:=2019.2
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 PKG_HASH:=70c3f6a6cf88d2b25681a76768a52ed92d9fe992ba8e358368b6a8088757adc8
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz

batman-adv/files/lib/netifd/proto/batadv_vlan.sh

@@ -5,7 +5,7 @@
 init_proto "$@"
 
 proto_batadv_vlan_init_config() {
-	proto_config_add_string "ap_isolation"
+	proto_config_add_boolean 'ap_isolation:bool'
 }
 
 proto_batadv_vlan_setup() {
@@ -17,7 +17,7 @@ proto_batadv_vlan_setup() {
 
 	json_get_vars ap_isolation
 
-	batctl -m "$iface" ap_isolation "$ap_isolation"
+	[ -n "$ap_isolation" ] && batctl -m "$iface" ap_isolation "$ap_isolation"
 	proto_init_update "$iface" 1
 	proto_send_update "$config"
 }