Unable to use LinearSpring and Isolator in the same model

## Bug Description
When LinearSpring and ComputeIsolatorDeformation are used in the same model, the simulation ends in an error: 

`*** ERROR ***
Material has no property named: deformations`

## Steps to Reproduce
[Google groups thread.](https://groups.google.com/g/mastodon-users/c/IIwkWQGx8mY)

## Impact
Currently cannot run a model with both isolators and linear springs present. 
