兼容Message缺少消息的异常,回复400错误码

src/main/java/com/genersoft/iot/vmp/gb28181/transmit/event/request/impl/message/MessageRequestProcessor.java

@@ -102,6 +102,11 @@ public class MessageRequestProcessor extends SIPRequestProcessorParent implement
                     sipEvent.getErrorEvent().response(eventResult);
                 }
             }else {
+                byte[] rawContent = request.getRawContent();
+                if (rawContent == null) {
+                    responseAck(request, Response.BAD_REQUEST, "content is null");
+                    return;
+                }
                 Element rootElement;
                 try {
                     rootElement = getRootElement(evt);