Unblock CI by xfailing test_dataframe_merge_empty_partitions

[pentschev]

No description provided.

[codecov-commenter]

Codecov Report

Merging #581 (5d9bc00) into branch-0.19 (7a6be90) will decrease coverage by 1.52%.
The diff coverage is n/a.

❗ Current head 5d9bc00 differs from pull request most recent head 835305d. Consider uploading reports for the commit 835305d to get more accurate results

@@               Coverage Diff               @@
##           branch-0.19     #581      +/-   ##
===============================================
- Coverage        61.98%   60.46%   -1.53%     
===============================================
  Files               22       22              
  Lines             2628     2628              
===============================================
- Hits              1629     1589      -40     
- Misses             999     1039      +40     

Impacted Files	Coverage Δ
dask_cuda/is_device_object.py	66.66% <0.00%> (-25.93%)	⬇️
dask_cuda/get_device_memory_objects.py	69.86% <0.00%> (-19.18%)	⬇️
dask_cuda/proxify_device_objects.py	80.32% <0.00%> (-9.84%)	⬇️
dask_cuda/initialize.py	88.88% <0.00%> (-3.71%)	⬇️
dask_cuda/cli/dask_cuda_worker.py	95.45% <0.00%> (-1.52%)	⬇️
dask_cuda/device_host_file.py	67.64% <0.00%> (-1.48%)	⬇️
dask_cuda/proxy_object.py	90.25% <0.00%> (-1.12%)	⬇️
dask_cuda/utils.py	89.83% <0.00%> (-1.07%)	⬇️
dask_cuda/_version.py	44.08% <0.00%> (-0.72%)	⬇️
dask_cuda/explicit_comms/dataframe/shuffle.py	97.26% <0.00%> (-0.69%)	⬇️

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[pentschev]

@rapidsai/ops-codeowners please approve when you have a chance.