Check if old state exists in neml2 predictor

[dschwen]

Reason

If a NEML2 model does not hav old state on the input axis the applyPredictor step in NEML2ModelExecutor will throw an exception.

Design

Use has_subaxis to check for the existence of the old state subaxis and bail early if it doesn't exist.

Impact

Enable models to run.

[moosebuild]

Job Documentation, step Docs: sync website on c990f43 wanted to post the following:

View the site here

This comment will be updated on new commits.

[hugary1995]

I suppose this is superseded by #29794

[hugary1995]

or no I mixed the two PRs

[moosebuild]

Job Coverage, step Generate coverage on c990f43 wanted to post the following:

Framework coverage

Coverage did not change

Modules coverage

Solid mechanics

	e5db19	#29832 c990f4
	Total	Total	+/-	New
Rate	84.99%	84.99%	-	100.00%
Hits	28631	28631	-	1
Misses	5058	5058	-	0

Diff coverage report

Full coverage report

Full coverage reports

Reports

• framework
• chemical_reactions
• combined
• contact
• electromagnetics
• external_petsc_solver
• fluid_properties
• fsi
• functional_expansion_tools
• geochemistry
• heat_transfer
• level_set
• misc
• navier_stokes
• optimization
• peridynamics
• phase_field
• porous_flow
• ray_tracing
• rdg
• reactor
• richards
• scalar_transport
• solid_mechanics
• solid_properties
• stochastic_tools
• thermal_hydraulics
• xfem

This comment will be updated on new commits.