Normalize "No results" output message for Zerochan and Paheal

[taskhawk]

This is the output shown whenever a search doesn't have any results for different booru sites:

[sankaku][info] No results for https://chan.sankakucomplex.com/?tags=non_existant_tag

[gelbooru][info] No results for https://gelbooru.com/index.php?page=post&s=list&tags=non_existant_tag

[danbooru][info] No results for https://danbooru.donmai.us/posts?tags=non_existant_tag

[yandere][info] No results for https://yande.re/post?tags=non_existant_tag

[konachan][info] No results for https://konachan.com/post?tags=non_existant_tag

[zerochan][error] HttpError: '404 Not Found' for 'https://www.zerochan.net/non+existant+tag?json=1&l=250&p=1'

[e621][info] No results for https://e621.net/post?tags=non_existant_tag

[tbib][info] No results for https://tbib.org/index.php?page=post&s=list&tags=non_existant_tag

[xbooru][info] No results for https://xbooru.com/index.php?page=post&s=list&tags=non_existant_tag

[rule34][info] No results for https://rule34.xxx/index.php?page=post&s=list&tags=non_existant_tag

[rule34us][info] No results for https://rule34.us/index.php?r=posts/index&q=non_existant_tag

[paheal][error] HttpError: '404 Not Found' for 'https://rule34.paheal.net/post/list/non_existant_tag/1'

[aibooru][info] No results for https://aibooru.online/posts?tags=non_existant_tag

IMO, Zerochan and Paheal should follow the same convention used for the others.

[mikf]

Should there also be a message with the error shown on the site itself, like "No such tag." or "No images were found to match the search criteria"?

And what about single posts? Should they also result in "No results for ..." or a NotFoundError exception or something else?

[taskhawk]

Should there also be a message with the error shown on the site itself, like "No such tag." or "No images were found to match the search criteria"?

Personally, I don't think it's necessary. They are basically the same as "No results" with different wording, it feels fine like that. Not sure if you meant that for all boorus, but having "Nobody here but us chickens!" is a bit silly of a message for a bunch of them.

And what about single posts? Should they also result in "No results for ..." or a NotFoundError exception or something else?

I actually don't download single posts in boorus so I don't have a feel for what would be best here. I think "No results for ..." would be fine.

While technically correct given they send out a 404 error code, displaying a simple message like that instead of the NotFoundError exception shows that everything worked as expected, it just didn't produce any result for that post, or search.