多级虚拟组织处理修复

src/main/java/com/genersoft/iot/vmp/gb28181/utils/XmlUtil.java

@@ -212,7 +212,7 @@ public class XmlUtil {
         }
         deviceChannel.setParentId(XmlUtil.getText(itemDevice, "ParentID"));
         String parentId = XmlUtil.getText(itemDevice, "ParentID");
-        if (parentId.contains("/")) {
+        if (parentId != null && parentId.contains("/")) {
             String lastParentId = parentId.substring(parentId.lastIndexOf("/") + 1);
             deviceChannel.setParentId(lastParentId);
         }else {