addressing review comment

services/compute/virtualmachine/wssd.go

@@ -312,7 +312,9 @@ func getWssdTags(tags map[string]*string) *wssdcloudproto.Tags {
 }
 
 func (c *client) virtualMachineValidations(opType wssdcloudproto.Operation, vmss *compute.VirtualMachine) error {
-
+	if vmss == nil || vmss.OsProfile == nil {
+		return nil
+	}
 	if vmss.OsProfile.ProxyConfiguration != nil && opType == wssdcloudproto.Operation_POST {
 		if vmss.OsProfile.ProxyConfiguration.HttpProxy != nil {
 			_, err := validations.ValidateProxyURL(*vmss.OsProfile.ProxyConfiguration.HttpProxy)