[REVIEW] Fix a NameError in meta dispatch API

[galipremsagar]

This PR fixes an incorrect usage with the correct usage of column(cudf.core.column).

cc: @charlesbluca

[charlesbluca]

Does this try block at the bottom of the file

cudf/python/dask_cudf/dask_cudf/backends.py

Lines 245 to 249 in 136722e

	try:
	from dask.dataframe.utils import group_split_dispatch, hash_object_dispatch
	from cudf.core.column import column

Have anything to do with the original use of column? Wondering if _get_non_empty_data() can/should be placed inside this block.

[galipremsagar]

Have anything to do with the original use of column? Wondering if _get_non_empty_data() can/should be placed inside this block.

_get_non_empty_data is also being used by other methods that are not related to group_split_dispatch & hash_object_dispatch. So it has to stay outside this try/catch block. But I did remove the column import in this block which will not make it confusing when someone works on an API in this file.

[codecov]

Codecov Report

Merging #7996 (0542d32) into branch-0.19 (8e1ffd4) will decrease coverage by 0.00%.
The diff coverage is 80.00%.

@@               Coverage Diff               @@
##           branch-0.19    #7996      +/-   ##
===============================================
- Coverage        82.74%   82.74%   -0.01%     
===============================================
  Files              103      103              
  Lines            17703    17702       -1     
===============================================
- Hits             14649    14648       -1     
  Misses            3054     3054              

Impacted Files	Coverage Δ
python/dask_cudf/dask_cudf/backends.py	89.51% <80.00%> (-0.08%)	⬇️

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