MNT: allow for exporting of non apogee flights.

[phmbressan]

Pull request type

• Code changes (bugfix, features)

Checklist

• Tests for the changes have been added (if needed)
• Lint (make format) has passed locally
• All tests (pytest tests -m slow --runslow) have passed locally
• CHANGELOG.md has been updated (if relevant)

Current behavior

Flights that do not reach apogee had their self.apogee attribute not initialized. Therefore, in exporting, the use of this attribute entails an error.

New behavior

The self.apogee is initialized as zero following other apogee pre-definitions (e.g. apogee state).

Breaking change

• Yes
• No

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.27%. Comparing base (20dc3be) to head (b11ad3c).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #863   +/-   ##
========================================
  Coverage    80.26%   80.27%           
========================================
  Files          104      104           
  Lines        12767    12768    +1     
========================================
+ Hits         10248    10249    +1     
  Misses        2519     2519           

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