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Bug in Variator::variate()

Observed by @ext-kranjcevic_m:

I've been looking at [..] commits c21cfcf1 and 29790810.

In Optimizer/EA/Variate.h, in variate, the individual can be declared infeasible (lines 221, 224). However, I don't see that it is then also removed from individualsToEvaluate_m, which can result in a segmentation fault in dispatch_forward_solves, because ind (line 459 in Optimizer/EA/FixedPisaNsga2.tcc) can be a null pointer. Fortunately, when the number of tries in the variator is high enough (e.g., 100 tries), this is unlikely to happen.

Executing lines 460-485 in Optimizer/EA/FixedPisaNsga2.tcc only if (ind != NULL) should fix the problem.

Edited by snuverink_j