Describe the bug

For the Wind model, choosing the define turbine design characteristics option and changing some values causes a callback error.

https://sam.nrel.gov/forum/forum-general/3731

To Reproduce

1. Create a Wind / Single Owner case.
2. On the Wind Turbine page, choose Define turbine characteristics.
3. Change Maximum tip-speed ratio to 6.8.
4. Press Enter or switch between Select a turbine from library and Define turbine design characteristics.

equation engine: [32]: eval error in statement list\

fail: [wind_turbine_powercurve_windspeeds,wind_turbine_powercurve_powerout,wind_turbine_rated_wind_speed,wind_turbine_powercurve_err_msg,wind_turbine_powercurve_hub_efficiency] = f( wind.turbine.radio_list_or_design,wind_turbine_powercurve_windspeeds_from_lib,wind_turbine_powercurve_powerout_from_lib,wind_turbine_kw_rating_from_lib,wind_turbine_kw_rating_input,wind_turbine_rotor_diameter_input,wind_turbine_hub_ht,wind.turbine.elevation,wind_resource_model_choice,wind_turbine_max_cp,wind.turbine.max_tip_speed,wind.turbine.max_tspeed_ratio,wind_turbine_cutin,wind_turbine_cut_out,wind.turbine.drive_train )
no variables calculated in a single iteration, cannot make progress!
eqn not evaluated: [wind_turbine_powercurve_windspeeds,wind_turbine_powercurve_powerout,wind_turbine_rated_wind_speed,wind_turbine_powercurve_err_msg,wind_turbine_powercurve_hub_efficiency] = f( wind.turbine.radio_list_or_design,wind_turbine_powercurve_windspeeds_from_lib,wind_turbine_powercurve_powerout_from_lib,wind_turbine_kw_rating_from_lib,wind_turbine_kw_rating_input,wind_turbine_rotor_diameter_input,wind_turbine_hub_ht,wind.turbine.elevation,wind_resource_model_choice,wind_turbine_max_cp,wind.turbine.max_tip_speed,wind.turbine.max_tspeed_ratio,wind_turbine_cutin,wind_turbine_cut_out,wind.turbine.drive_train)

Expected behavior

SAM should accept different values for parameters, and return a message if there are problems with the value.

Screenshots

Operating System and Version

Tested in SAM 2021.12.02 on Windows 10