info don't show value for bad __str__

[braingram]

Description

if __str__ fails during asdf.info or returns multiple lines then don't show the value.

This fixes the current roman_datamodels downstream job which is failing due to a wcs which contains no transforms which causes gwcs to fail a __str__ call.

A PR is open to fix the __str__ issue in gwcs: https://github.com/spacetelescope/gwcs/pull/489

However even with the above fix the WCS.__str__ result is a multi-line string which breaks info formatting. To deal with this, this PR also checks the __str__ output for multiple lines and in that case discards the __str__ result.

To provide a few examples using a tree containing gwcs.WCS(output_frame="icrs").

Without the gwcs PR and with asdf main, asdf.info returns:

File ~/projects/src/gwcs/gwcs/wcs.py:1347, in WCS.__str__(self)
   1344 for item in self._pipeline[: -1]:
   1345     #model = item[1]
   1346     model = item.transform
-> 1347     if model.name is not None:
   1348         col2.append(model.name)
   1349     else:

AttributeError: 'NoneType' object has no attribute 'name'

With the above gwcs PR with asdf 3.0.1 (the latest release), asdf.info returns:

└─w (WCS)

With the above gwcs PR and asdf main, asdf.info returns (note the break in formatting)

└─w (WCS):   From   Transform
-------- ---------
detector      None
    icrs      None

With (or without) the above gwcs PR and with this PR, asdf.info returns:

└─w (WCS)

Note that with this PR time formatting is still preserved (so the issue #1686) fixed by #1687 is still fixed:

└─t (Time): 2024-02-03 14:20:29.350503

Finally, this PR fixes the changelog error where #1687 is listed under the wrong version (see the changelog for 3.0.x).

The weldx downstream error is unrelated (and caused by a new pandas).

Checklist:

• [ ] pre-commit checks ran successfully
• [ ] tests ran successfully
• [ ] for a public change, a changelog entry was added
• [ ] for a public change, documentation was updated
• [ ] for any new features, unit tests were added