fix/TD-10717 <fix> tips if insert operation using multi empty comma

src/client/src/tscParseInsert.c

@@ -1419,6 +1419,11 @@ int tsParseInsertSql(SSqlObj *pSql) {
         goto _clean;
       }
 
+      if (sToken.type == TK_ILLEGAL) {  // ,,,, like => insert into t values(now,1),,,,(now+1s,2);
+        code = tscSQLSyntaxErrMsg(pInsertParam->msg, NULL, str);
+        goto _clean;
+      }
+
       /*
        * if no data has been generated during parsing the sql string, error msg will return
        * Otherwise, create the first submit block and submit to virtual node.

src/util/src/ttokenizer.c

@@ -626,6 +626,7 @@ SStrToken tStrGetToken(char* str, int32_t* i, bool isPrevOptr) {
     while (isspace(t) || t == ',') {
       if (t == ',' && (++numOfComma > 1)) {  // comma only allowed once
         t0.n = 0;
+        t0.type = TK_ILLEGAL;
         return t0;
       }