Error messages were removed from `.title` command

[dgw]

In #1510, the error feedback Sopel used to output if it couldn't find a title for one or more URL given to the .title command got removed. This is kind of regression-y, and was shipped already in 7.0.x before someone mentioned it. Here's how it looked:

sopel/sopel/modules/url.py

Lines 132 to 137 in 806f296

	# Nice to have different failure messages for one-and-only requested URL
	# failed vs. one-of-many failed.
	if len(urls) == 1 and not results:
	bot.reply('Sorry, fetching that title failed. Make sure the site is working.')
	elif len(urls) > len(results):
	bot.reply('I couldn\'t get all of the titles, but I fetched what I could!')

Might not be practical to do exactly the same thing now due to use of generators, but something similar would be enough.