DOC: warning from registry example

[bsipocz]

The example we show in the documentation issues a W02 warning. Is there anything we can do about it? It's not like the users can, so it should either be captured in the library code itself, or the example reworked so it's not being issued to begin with

cc @msdemlei

Code:

from pyvo import registry
resources = registry.search(registry.UCD("src.redshift"), registry.Freetext("supernova"))
resources[4].get_tables()

warning:

/Users/bsipocz/munka/devel/pyvo/pyvo/io/vosi/vodataservice.py:836: W02: ?:?:?: W02: '' is not a valid datatype according to the VOSI spec
  vo_warn(W02, value, self._config, self._pos)
Out[4]: {'J/A+A/437/789/table2': <Table name="J/A+A/437/789/table2">... 19 columns ...</Table>}

[bsipocz]

OK, so this one actually came up in the PR review, and is something upstream:

#289 (comment)

I'll add the ignore warnings for the doctests, yet would encourage to think about using an example that doesn't throw the warning.

[msdemlei]

On Tue, Sep 20, 2022 at 01:59:09PM -0700, Brigitta Sipőcz wrote: OK, so this one actually came up in the PR review, and is something upstream: #289 (comment) I'll add the ignore warnings for the doctests, yet would encourage to think about using an example that doesn't throw the warning.

That's a minor VizieR bug; they don't have types on their generated columns _ra and _de at this point. I'll ping them -- let's get this fixed upstream rather than do local workarounds. Having said that, it's a good thing I looked at these docs again -- PR coming up...