Bot reports latest affected version as the fix version, even when there is no fix version

[Arcensoth]

Apparently the XML document returned by JIRA does not include the "fix version" for whatever reason:

https://github.com/Arcensoth/cogbot/blob/master/cogbot/extensions/jira.py#L121

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https://bugs.mojang.com/browse/MC-139625

https://bugs.mojang.com/si/jira.issueviews:issue-xml/MC-139625/MC-139625.xml?field=link&field=description&field=key&field=summary&field=status&field=resolution&field=assignee&field=reporter&field=created&field=resolved&field=version&field=fixVersion&field=votes&field=watches

[Arcensoth]

https://bugs.mojang.com/browse/MC-124241

https://bugs.mojang.com/si/jira.issueviews:issue-xml/MC-124241/MC-124241.xml?field=link&field=description&field=key&field=summary&field=status&field=resolution&field=assignee&field=reporter&field=created&field=resolved&field=version&field=fixVersion&field=votes&field=watches

[Arcensoth]

https://community.atlassian.com/t5/Jira-questions/Why-is-a-JIRA-issue-with-an-EMPTY-fixversion-retured-in-query/qaq-p/41800

https://jira.atlassian.com/browse/JRASERVER-45149