Problems with python bindings

[thboettc]

The purpose of this issue is to keep track of all of the issues with the python bindings in one place. Feel free to edit as issues are discovered. FYI @FlorianReiss @jcob95 @JuanBSLeite

• Mismatch between expected and generated array sizes in GenerateSig in Amp4Body_TD: Simple script to generate amplitude projections for a model #329
• Failure in the pipipi0 example
• DalitzPlotter::make2D functions differently depending on whether or not a dataset has been added.