Check for null device and send refresh() from configure()

devicetypes/smartthings/zooz-power-strip.src/zooz-power-strip.groovy

@@ -25,6 +25,7 @@ metadata {
 		capability "Refresh"
 		capability "Actuator"
 		capability "Sensor"
+		capability "Configuration"
 
 		fingerprint manufacturer: "015D", prod: "0651", model: "F51C", deviceJoinName: "Zooz ZEN 20 Power Strip"
 	}
@@ -65,6 +66,10 @@ def updated() {
 	}
 }
 
+def configure() {
+	refresh()
+}
+
 
 //////////////////////
 // Event Generation //
@@ -107,6 +112,7 @@ def zwaveBinaryEvent(cmd, endpoint) {
 	def result = []
 	def children = childDevices
 	def childDevice = children.find{it.deviceNetworkId.endsWith("$endpoint")}
+	if (childDevice) {
 		childDevice.sendEvent(name: "switch", value: cmd.value ? "on" : "off")
 
 		if (cmd.value) {
@@ -114,10 +120,11 @@ def zwaveBinaryEvent(cmd, endpoint) {
 			result << createEvent(name: "switch", value: "on")
 		} else {
 			// All off and the strip is off
-		if (! children.any { it.currentValue("switch") == "on" }) {
+			if (!children.any { it.currentValue("switch") == "on" }) {
 				result << createEvent(name: "switch", value: "off")
 			}
 		}
+	}
 	result
 }