[ML] Guard against possible boost exceptions creating chi distribution #23
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This guards all remaining unchecked calls to create a chi distribution with potentially zero degrees freedom. Some of these cases should definitely never happen currently, but it seems that #13 wasn't sufficient to fix #20. In all these cases the behaviour when degrees freedom is zero is clearcut and an always false condition should be very cheap so this change seems prudent. This code has not yet been released so marking as a non-issue.
This should fix #20.