make setup_orekit_data more robust

Clément Jonglezrequested to merge
fix-setup-orekit-data-no-args into master

Fixes #1 (closed):

  • Adds two unit tests for the case that the orekitdata library is not present
  • Adds a default value to the filenames argument in setup_orekit_data (orekit-data.zip), and adds a check for filename being None in setup_orekit_curdir
  • Adds a test step in the gitlab CI to run PyhelpersTest.py twice, without and then with the orekitdata library installed

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