fix urlib opener bug

[blcksrx]

CATEGORY

Choose one

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

urllib opener does not have any method called content and for getting the content of the response should invoke read() method.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue: _get_slice_data fails to send slice data when Celery Workers are on another instance #8784 Schedule Email Reports for Charts works incorrect #8286
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

[codecov-io]

Codecov Report

Merging #8788 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #8788      +/-   ##
==========================================
+ Coverage   65.83%   65.83%   +<.01%     
==========================================
  Files         482      482              
  Lines       24155    24156       +1     
  Branches     2770     2770              
==========================================
+ Hits        15903    15904       +1     
  Misses       8074     8074              
  Partials      178      178

Impacted Files	Coverage Δ
superset/tasks/schedules.py	80% <100%> (+0.1%)	⬆️

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[mistercrunch]

This feature was community contributed and isn't actively used by the committers. Merging

[blcksrx]

This feature was community contributed and isn't actively used by the committers. Merging

It's really a good feature