Fix PL compatibility

[ethanwharris]

What does this PR do?

Fixes # (issue)

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[codecov]

Codecov Report

Merging #690 (742a156) into master (828fbf0) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #690   +/-   ##
=======================================
  Coverage   90.20%   90.21%           
=======================================
  Files         192      192           
  Lines        9905     9913    +8     
=======================================
+ Hits         8935     8943    +8     
  Misses        970      970           

Flag	Coverage Δ
gpu	?
pytest	?
unittests	90.21% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
flash/core/data/data_pipeline.py	94.51% <100.00%> (+0.12%)	⬆️
flash/core/utilities/imports.py	90.40% <100.00%> (+0.07%)	⬆️

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