PENDING phase for TAP queries

When trying to perform an asynchronous query to the VizieR TAP server http://TAPVizieR.u-strasbg.fr/TAPVizieR/tap/ I saw that sometimes the server replies with a `PENDING` phase. However, this specific phase is not recognised by the `wait` method as an _active_ phase, and as a result the method can raise a `DALServiceError` exception.

Shouldn't this phase be added in the code of the `wait` method?

Start at the wait method that handles asynchronous TAP queries and inspect how it identifies active phases. Reproduce or review the PENDING response from the VizieR TAP server, then verify that this phase no longer causes a DALServiceError. The issue does not name a file or test to run.

Written by the indexing model from the issue text.