Bugfix for trip scheduling choice #884
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Remove problem code for sharrow load
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The trip scheduling model currently was set with
allow_zero_probs=Truebut immediately after running the choice model it includes an assertion that all the choices are valid. Really we want to disallow zero probabilities. By setting this to false we also automatically engage underflow protection on the probabilities when the utility dtype is float32 (as happens with sharrow enabled).Also this PR temporarily removes a problematic block of code when tracing and sharrow are both enabled.