Weibo: "User does not exist" when using --name on certain accounts

Haven't tested with user IDs.

```
~/u/steam ❯❯❯ python3 parse_weibo.deduped >> weibo.jsonl
['snscrape', '--jsonl', '--progress', 'weibo-user', '--name', 'fangshengmeng']
2022-04-03 22:27:12.723 WARNING snscrape.modules.weibo User does not exist
Finished, 0 results
['snscrape', '--jsonl', '--progress', 'weibo-user', '--name', 'qukean']
2022-04-03 22:27:14.052 WARNING snscrape.modules.weibo User does not exist
Finished, 0 results
['snscrape', '--jsonl', '--progress', 'weibo-user', '--name', 'yetuavg']
2022-04-03 22:27:15.280 WARNING snscrape.modules.weibo User does not exist
Finished, 0 results
['snscrape', '--jsonl', '--progress', 'weibo-user', '--name', 'zhangfrank110']
2022-04-03 22:27:16.472 WARNING snscrape.modules.weibo User does not exist
Finished, 0 results
```

With verbose output (can't get locals because it didn,t crash; you should add an option to dump them anyway):

```
~/u/steam ❯❯❯ snscrape -v --progress --jsonl weibo-user --name fangshengmeng 2
2022-04-03 22:29:29.953 INFO snscrape.base Retrieving https://m.weibo.cn/n/fangshengmeng
2022-04-03 22:29:31.017 INFO snscrape.base Retrieved https://m.weibo.cn/n/fangshengmeng: 200
2022-04-03 22:29:31.017 WARNING snscrape.modules.weibo User does not exist
2022-04-03 22:29:31.017 INFO snscrape._cli Done, found 0 results
Finished, 0 results
```

Also it seems really unintuitive to have to add --name as an option if it's not a user ID; could this be fixed like it was with the Twitter scraper, i.e. seeing if it's an int?