meter.MeasureIndexer returns empty dataframe

[musicnerd]

running the get_data method with argument 'measure' or 'meter.MeasureIndexer' on an indexed piece returns an empty dataframe. I've tried this with many different pieces and using both midi and kern. I guess this will have to be rewritten, or else we just have to revert back to music21 to compute and convert back into a pandas series.

[musicnerd]

OK so I did get the measure indexer to work, but only with VIS 3.X (obviously) and only with file formats that contain measures (which apparently midi does not). Not sure why the previous tests with kern didn't work.