- Update to 6.1.5
## Bug Fixes
### astropy.coordinates
* Ensure that coordinates can be transformed to other coordinate
frames also if they have size zero (i.e., hold empty data
arrays). [#17013]
* Longitude and Latitude can no longer be initialized with
strings ending in “N” or “S”, and “E” or “W”, respectively,
since those suggest the other type. [#17132]
* np.nanvar(angle) now produces a Quantity with the correct unit,
rather than raising an exception. [#17239]
* Fix a crash when instantiating Angle (or Latitude, or
Longitude) from a non-numpy array (for instance pyarrow
arrays). [#17263]
### astropy.io.fits
* Fix access to VLA columns after slicing .data. [#16996]
### astropy.io.votable
* Updated xml writer for VOTable Resource elements to include
groups. [#17344]
### astropy.nddata
* Add support for positional only and keyword only arguments when
using the support_nddata decorator. [#17281]
### astropy.stats
* Fixed a bug where float32 inputs to sigma_clip and SigmaClip
were changed to float. [#17086]
### astropy.table
* Fix a crash when calling Column.pprint on a scalar column.
[#15749]
* Ensure that setting an existing column to a scalar always
properly fills it (rather than breaking the table if there was