dat file empty 2d set error

[DLWoodruff]

empty2d.zip The attached files have an example of an AMPL-format dat file with an empty 2 dimensional set that results in an error. A potential fix that seems like it might work is as follows: in PyomoModel.py in _tupelize add if len(list(data.keys())) == 1 and list(data.keys())[0] is None and len(data[None]) == 0: return None right before ans = {} but there is probably something better. To see the error, use something like: pyomo solve 2dDAT.py empty2d.dat --solver=cplex

[mrmundt]

@DLWoodruff @blnicho - I'm going through old bug reports. Is this bug still present in the most recent Pyomo version?

[mrmundt]

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