Fix for error checking covering R1rho off resonance models in target function.
This is for checking presence of chemical shifts and r1.
sr #3135(https://gna.org/support/?3135): Optimisation of the R1 relaxation rate for the off-resonance R1rho relaxation dispersion models.
Authored by: tlinnet 2014-08-05
Parent: [r24967]
Child: [r24969]
