mizu0fire0

### Description when definining a turboprop engine with an external propeller map provided by the user like this : `shaft_model=EngineDeck(name='shaft',options=options,required_variables=required_vars)` `propeller=PropellerMap(name='Centauri_propeller',options=options)` `turboprop=TurbopropModel('turboprop',options=options,shaft_power_model=shaft_model,propeller_model=propeller)` `prob.load_inputs(r'aircraft_definition.csv',phase_info,engine_builders=[turboprop],verbosity=3)` this leads to an error in the...