Align math-domain catching for model DPL94 with trunk implementation.
task #7793: (https://gna.org/task/?7793) Speed-up of dispersion models.
This is to implement catching of math domain errors, before they occur.
The catching of errors have to be more careful.
Authored by: tlinnet 2014-05-21
Parent: [r23295]
Child: [r23297]
