#744 Use Option for pdf price list

[ArtemijRodionov]

Closes #744

[duker33]

minor naming and code style

[duker33]

Suggested change

	def test_tags_group(self):
	def test_tags_are_grouped(self):

And we can get rid of additional comment

[duker33]

Suggested change

	_, grouped_tags = zip(*self.context['group_tags_pairs'])
	grouped_tags = [tags for _, tags in self.context['group_tags_pairs']

Would be more readable in my taste.

or even the whole expression

tags = set([t for tags for _, tags in self.context['group_tags_pairs'] for t in tags])

Up to you

[duker33]

@artemiy312 , let me comment on our microtasking style. Here you've done contexts refactoring which has nothing common with solving issue with pdf price list.

What seems to me as more clear decision:

• create task to refactor a piece of code directly with Github
• you should be rewarded on task creating. So you log astro time as we are having no autorewarding for tasks system
• block the current task about pdf prices since it'll use the future refactored code
• resolve the fresh created task

It's doesn't matter in this concrete case, but we should develop solid microtasking style for the future 💪