support for non-hashable objects

[stared]

If a column has non-hashable objects, creation of DataFrameSummary gives an error:

TypeError: unhashable type: 'list'

It would be great if work also for these entries (e.g. looking at their length); or at very least - discard these variables.

[dsalaj]

Exactly. It would be much more usable if it could at least ignore unhashable type columns. Or even better count the number of empty rows. That would be very useful.

[mmourafiq]

PRs are welcome :)