Avoid error when unconstrained_params is empty#1
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Calling `rand(Distributions.Dirichlet(unconstrained_params))` gives an error when there are no unconstrained params. Instead should return unconstrained_vals as an empty array, no? Also I see an identical dirichlet.jl file in other places [e.g. here](https://github.com/Matheer0/probabilistic-programming/blob/16c85a37a71ba0414ac44f0ec3ab34e9071982b5/dirichlet.jl). I also made a PR there, but I'm not sure where this code originally came from, so I'm making it here too.
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Calling
rand(Distributions.Dirichlet(unconstrained_params))gives an error when there are no unconstrained params. Instead should return unconstrained_vals as an empty array, no?