Better fix for doi parsing

[NicoKiaru]

I'm trying to retrieve the doi of the atlases from BrainGlobe here:

abba_python/src/abba_python/abba_atlas.py

Lines 46 to 49 in 0e8cab3

	try:
	self.dois.add(JString(self.atlas.metadata['citation'].split("doi.org/", 1)[1]))
	except:
	self.dois.add(JString("could not parse doi"))

However I had to catch an exception for the kim_mouse_idisco atlas (and probably others).

A better fix would be nice, I need to print and look at it.

[adamltyson]

We don't enforce any kind of structure for the citation string, but we probably should. I've raised brainglobe/brainglobe-atlasapi#404 to track this. It probably won't be a quick fix unfortunately though.