ntome authored Feb 27, 2020 and hydrargyrum committed Mar 05, 2020

The use case of this patch is being able to perform:

   Base(TableCell('foo'), CleanText('./span'))

It was impossible without because CleanText was called with a list of
matching elements, instead of a single lxml element.

Not sure if it's the right way to fix the problem. Other ways include:
- modifying TableCell to return the element instead of a list of
elements
- modifying CleanText to accept a list of elements
- introducing another filter to take only the first element