fix_353

[d-chambers]

Description

Fixes #353.

The problem was the example event 2 has a time coordinate that has a dtype of float rather than datetime64 so the obspy converter needed to be made robust to this.

Checklist

I have (if applicable):

• referenced the GitHub issue this PR closes.
• documented the new feature with docstrings or appropriate doc page.
• included a test. See testing guidelines.
• your name has been added to the contributors page (docs/contributors.md).
• added the "ready_for_review" tag once the PR is ready to be reviewed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.53%. Comparing base (1d49530) to head (35fecf1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #354   +/-   ##
=======================================
  Coverage   99.53%   99.53%           
=======================================
  Files          91       94    +3     
  Lines        7249     7341   +92     
=======================================
+ Hits         7215     7307   +92     
  Misses         34       34           

Flag	Coverage Δ
unittests	99.53% <100.00%> (+<0.01%)	⬆️

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