Improved check of interface IPs

interface.go

@@ -190,17 +190,18 @@ func (b *AbstractBridge) IsAssigned() bool {
 		log.Printf("Error is: %s\n", err.Error())
 		return false
 	}
+
+	if len(addrs) < 1 {
+		log.Printf("Interface has NO ip addresses")
+		return false
+	}
+
 	for _, addr := range addrs { // get ipv4 address
 		if ipv4Addr = addr.(*net.IPNet).IP.To4(); ipv4Addr != nil {
 			log.Printf("Error reading IPs for interface %s\n", interfaceName)
-			log.Printf("Error is: %s\n", err.Error())
-			break
-		}
-	}
-	if ipv4Addr == nil {
-		log.Printf("interface %s don't have an ipv4 address\n", interfaceName)
 			return false
 		}
+	}
 
 	for _, addr := range addrs {
 		if addr.String() == bridgeip {