[OLAF] Twist Not Computed in OLAF cases when Polar Projection is used, resulting in wrong Fn, Ft outputs

[ebranlard]

Bug description
The output variable PitchAndTwist is used to compute Fn, Ft, Cn, Ct, and Theta.
It's taken from thetaBladeNds, but thetaBladeNds is not defined when we use the polar BEM projection.

Below the following line, we should compute the twist.
(https://github.com/OpenFAST/openfast/blob/dev/modules/aerodyn/src/AeroDyn.f90#L3570)

I'll submit a pull request shortly.

OpenFAST Version
Current dev

[andrew-platt]

Fixed with #2349