getCyclopsProfileLogLikelihood crashes when all slope values are NA

[azimov]

PR incoming that is a potential solution but it appears to fail unit tests so this likely requires a deeper understanding of the function that I have.

This error occurs in getCyclopsProfileLogLikelihood when a model is IllConditioned:

Message:  missing value where TRUE/FALSE needed

(Apologies for lack of details, getting a full stack trace out of a Strategus run takes time).

Upon live debugging it appears to be this line:

Cyclops/R/ModelFit.R

Line 966 in 22cf1b7

if (resetsPerformed < maxResets && !all(slopes[2:length(slopes)] < slopes[1:(length(slopes)-1)])) {

Live debugging shows that the Model is illconditioned and all values of slopes are NA(presumably because of the gradient calculations on the lines above).

I will try to get a reproducible example but my quick tests of the PR branch appear to show that this is because of all being called on a vector of NAs. A better solution may be more pre-validation.