[#1676] Treat zero-length SymmetricComponent as tube/disk #1677
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This PR fixes #1676 by setting the longitudinal and rotational inertia of a SymmetricComponent (transition/nose cone) to zero if the component length is zero. To then have the same behavior as a phantom body tube (the component acts as a disk and can still cause drag), I match the fore and aft radius to the max value of the two when the component length is zero. This is because a zero-length transition is just a disk, and a disk is just a zero-length tube. So matching the fore and aft radius will let the transition behave like a zero-length tube.