Cannot open a CSV from "Open with ..." menu about jupyterlab_voyager HOT 4 OPEN

@suvayu per a quick test on http://vega.github.io/voyager/

This is the behavior directly from Voyager. I'm not sure if they chose not to create fallbacks for a valid reason -- usually it's best practice to not manipulate data received in anyway.

@saulshanabrook what do you think about adding in a fallback for handling empty columns in data?

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@suvayu

Can you post more information about your issue, as there's some known potential issues with some .csv files, but most of the .csvs i have been trying do open properly

Firstly, can you try to open up the data.csv in test/data included within this repository

1.Steps to reproduce(including the dateset you're trying)
2.Any relevant logs from jupyterlab
3.Any relevant logs from JavaScript console

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@playermanny2 I digged a bit deeper, it turns out this error happens when there is an empty column name in the csv. In my case I had exported the csv from pandas with DataFrame.to_csv(..). By default (if you specify only the file name and nothing else, then header=True, index=True, index_label=None), the column name for index is empty. When I manually edit and add the index column name, the csv opens without issues.

Since this is rather common, maybe Voyager should assume a place holder like: column_n, if the column name is empty?

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@suvayu

Thanks for digging into this deeper --will have to take a look at this a bit deeper to see if this is a problem with voyager itself not being able to handle empty column names or our extension.

The fallback seems like it could be a viable route

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