force there to be at least three elements in time reconstruction
This should hopefully resolve issues like
...bilby/gw/likelihood.py", line 403, in generate_time_sample_from_marginalized_likelihood
"Time posterior reconstruction failed, at least two samples "
bilby.core.likelihood.MarginalizedLikelihoodReconstructionError: Time posterior reconstruction failed, at least two samples are required.
This should be tested more.