Merge pull request #5235 from taosdata/fix/TD-2999

[TD-2999]<fix>: [http] fix NULL parser crash

src/plugins/http/src/httpContext.c

@@ -186,9 +186,9 @@ void httpCloseContextByApp(HttpContext *pContext) {
   pContext->parsed = false;
   bool keepAlive = true;
 
-  if (parser->httpVersion == HTTP_VERSION_10 && parser->keepAlive != HTTP_KEEPALIVE_ENABLE) {
+  if (parser && parser->httpVersion == HTTP_VERSION_10 && parser->keepAlive != HTTP_KEEPALIVE_ENABLE) {
     keepAlive = false;
-  } else if (parser->httpVersion != HTTP_VERSION_10 && parser->keepAlive == HTTP_KEEPALIVE_DISABLE) {
+  } else if (parser && parser->httpVersion != HTTP_VERSION_10 && parser->keepAlive == HTTP_KEEPALIVE_DISABLE) {
     keepAlive = false;
   } else {
   }