Fix export segfault

[mslipper]

Closes #1834

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
• Wrote tests
• Updated relevant documentation (docs/)
• Added entries in PENDING.md with issue #
• rereviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[alexanderbez]

utACK -- looks great @mslipper, just left a remark or two 👍

[alexanderbez]

Returning genesis file. I think might sound a bit better?

[alexanderbez]

@ValarDragon is this sanity check enough or is there a more direct method we can perform via some attempted state lookup?

[ValarDragon]

Seems fine to me since we ensure all file writes persist to disk. I think we can merge this, and then write an issue to query state directly later. (#postlaunch concern)

[alexanderbez]

Should we check for other top level keys?

[alexanderbez]

Also let's merge develop in so the test_sim_gaia_fast will pass 👍

[codecov]

Codecov Report

Merging #2128 into develop will increase coverage by 0.05%.
The diff coverage is 50%.

@@             Coverage Diff             @@
##           develop    #2128      +/-   ##
===========================================
+ Coverage    63.85%   63.91%   +0.05%     
===========================================
  Files          134      134              
  Lines         8175     8194      +19     
===========================================
+ Hits          5220     5237      +17     
+ Misses        2605     2604       -1     
- Partials       350      353       +3

[cwgoes]

utACK, thanks.

In the future, please don't continuously squash commits - we can do that when we merge (the checklist is confusing, sorry...)