Fix DataPipeline resolution in Task

[ethanwharris]

What does this PR do?

Fixes #211

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[tchaton]

LGTM !

[codecov]

Codecov Report

Merging #212 (3ed7b82) into master (6185bda) will increase coverage by 0.23%.
The diff coverage is 93.10%.

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
+ Coverage   86.33%   86.56%   +0.23%     
==========================================
  Files          57       57              
  Lines        2759     2747      -12     
==========================================
- Hits         2382     2378       -4     
+ Misses        377      369       -8     

Flag	Coverage Δ
unittests	86.56% <93.10%> (+0.23%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flash/vision/embedding/model.py	74.35% <ø> (+0.54%)	⬆️
flash/core/model.py	96.22% <92.85%> (+4.01%)	⬆️
flash/core/classification.py	100.00% <100.00%> (ø)

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