Fix condition oct diel func
Description
Fix condition for the utility oct-dielectric-function for transient absorption, if the variable GaugeFieldDelay was not present, but TransientAbsorptionReference was there.
News snippet
Fix condition for the utility oct-dielectric-function for transient absorption, if the variable GaugeFieldDelay was not present, but TransientAbsorptionReference was there.
Checklist
- I have checked that my code follows the Octopus coding standards
- I have added tests for all the new features added in this request.