new csm test, no prior,

[dehann]

cc @GearsAD -- #485, thanks!

Need to resolve tree case where leaves have not factors, as occurred here:
#485 (comment)

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@1ed5e81). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master     #487   +/-   ##
=========================================
  Coverage          ?   46.43%           
=========================================
  Files             ?       29           
  Lines             ?     3754           
  Branches          ?        0           
=========================================
  Hits              ?     1743           
  Misses            ?     2011           
  Partials          ?        0

Impacted Files	Coverage Δ
src/IncrementalInference.jl	66.66% <ø> (ø)
src/JunctionTree.jl	70.5% <0%> (ø)

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