fix error if there is a space in the end of insert sql in python test case

src/util/src/ttokenizer.c

@@ -632,7 +632,10 @@ SStrToken tStrGetToken(char* str, int32_t* i, bool isPrevOptr) {
 
       t = str[++(*i)];
     }
-
+    if (str[*i] == 0) {
+      t0.n = 0;
+      return t0;
+    }
     t0.n = tGetToken(&str[*i], &t0.type);
     break;