only warn if there are too many labels in simulations #901
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I don't know why this didn't come up before, but it is possible that we will end up with more cell type labels than we want to simulate, and we probably shouldn't die in that case. A warning will do.
This does present some possible downstream conditions where a module might try to use a label that is not present in the data and fails in testing, but that seems like a rare case, and probably is going to create other problems for using the simulated data as well.