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Code warnings during docs build

See original GitHub issue

While building documentation, I get the warnings below, at least some of which suggest documentation is out of date. Generally, I don’t think any code we include should generate warnings, so it would be good to fix this. More generally, perhaps we should start failing on any warning from the docs build?

/usr/lib/python3/dist-packages/numpy/lib/function_base.py:3405: RuntimeWarning: All-NaN slice encountered
  r = func(a, **kwargs)
WARNING: Input data contains invalid values (NaNs or infs), which were automatically clipped. [astropy.stats.sigma_clipping]
WARNING: Input data contains invalid values (NaNs or infs), which were automatically clipped. [astropy.stats.sigma_clipping]
/data/mhvk/packages/astropy/build/lib.linux-x86_64-3.7/astropy/timeseries/downsample.py:28: RuntimeWarning: Mean of empty slice
  result.append(function(array[indices[i]:indices[i+1]]))
/data/mhvk/packages/astropy/build/lib.linux-x86_64-3.7/astropy/timeseries/downsample.py:29: RuntimeWarning: Mean of empty slice
  result.append(function(array[indices[-1]:]))
WARNING: ErfaWarning: ERFA function "utctai" yielded 1 of "dubious year (Note 3)" [astropy._erfa.core]
/usr/lib/python3/dist-packages/matplotlib/figure.py:98: MatplotlibDeprecationWarning: 
Adding an axes using the same arguments as a previous axes currently reuses the earlier instance.  In a future version, a new instance will always be created and returned.  Meanwhile, this warning can be suppressed, and the future behavior ensured, by passing a unique label to each axes instance.
  "Adding an axes using the same arguments as a previous axes "
WARNING: AstropyDeprecationWarning: Importing LombScargle from astropy.stats has been deprecated and will no longer be supported in future. Please import this class from the astropy.timeseries module instead [astropy.stats.lombscargle]
WARNING: AstropyDeprecationWarning: Importing BoxLeastSquares from astropy.stats has been deprecated and will no longer be supported in future. Please import this class from the astropy.timeseries module instead [astropy.stats.bls]