Feature/33 api fails when no pilots or logbook entries (#35)

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* api no longer fails when no pilots or logbook entries

* Refactoring

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* adding test environment

* adding test environment

This commit was merged in pull request #35.