fix: syntax error when influxdb lines has no fields

src/client/src/tscParseLineProtocol.c

@@ -2608,7 +2608,7 @@ int32_t tscParseLine(const char* sql, TAOS_SML_DATA_POINT* smlData, SSmlLinesInf
     return ret;
   }
   tscDebug("SML:0x%"PRIx64" Parse fields finished, num of fields:%d", info->id, smlData->fieldNum);
-  if (smlData->fieldNum == 0) {
+  if (smlData->fieldNum <= 1) {
     tscDebug("SML:0x%"PRIx64" Parse fields error, no field in line", info->id);
     taosHashCleanup(keyHashTable);
     return TSDB_CODE_TSC_LINE_SYNTAX_ERROR;