Shifter: Components using profile curves create division by zero issue with impair division values

[jdrese]

Issue

When using impair subdivisions values on the neck component this causes the middle stretch values on root to be 1 and this been causes the division by zero later on.

[jdrese]

This issue is more general. Because of the profile curve and how the squashStretch solver and multiplication nodes are hook together this creates an issue with the strech value generating a division by 0 error.