Now warnings is raised if no R1 data is available. An error is raised if the R1rho model is expected to have R1 data, and it is not available.
That makes systemtest: Relax_disp.test_r1rho_kjaergaard_missing_r1() fail, which is the expected behaviour.
sr #3135(https://gna.org/support/?3135): Optimisation of the R1 relaxation rate for the off-resonance R1rho relaxation dispersion models.
bug #21788(https://gna.org/bugs/?21788): Only Warning is raised for missing loading R1 relaxation rate for the off-resonance R1rho relaxation dispersion models.
