[CPP]. Open and close TsFile without writing data will meet error code 2.

Test code as below:
```c++
CTsFileWriter writer = ts_writer_open(TSFILE_NAME, &code);
ASSERT_EQ(code, 0);
ASSERT_NE(writer, nullptr);
code = ts_writer_close(writer);
ASSERT_EQ(access(TSFILE_NAME, F_OK), 0);
ASSERT_EQ(code, E_OK); // assert failed
```

Reproduce the failure with the shown C++ calls to ts_writer_open and ts_writer_close, then trace the empty-writer close path and the returned error code. Done means closing a successfully opened file without written data returns E_OK and the file still exists.

Written by the indexing model from the issue text.