fix for system task with external payload storage

[apanicker-nflx]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 3255

• 14 of 14 (100.0%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.04%) to 70.218%

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Files with Coverage Reduction	New Missed Lines	%
server/src/main/java/com/netflix/conductor/server/JerseyModule.java	1	90.91%

Totals
Change from base Build 3251:	0.04%
Covered Lines:	10275
Relevant Lines:	14633

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💛 - Coveralls

[codecov]

Codecov Report

Merging #1365 into dev will increase coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                dev    #1365      +/-   ##
============================================
+ Coverage     64.31%   64.36%   +0.04%     
- Complexity     2847     2850       +3     
============================================
  Files           241      241              
  Lines         14316    14324       +8     
  Branches       1409     1410       +1     
============================================
+ Hits           9207     9219      +12     
+ Misses         4329     4325       -4     
  Partials        780      780

Impacted Files	Coverage Δ	Complexity Δ
...flix/conductor/core/execution/WorkflowSweeper.java	75% <100%> (ø)	8 <1> (ø)	⬇️
...lix/conductor/core/execution/WorkflowExecutor.java	76.78% <100%> (+0.17%)	138 <0> (+1)	⬆️
...tflix/conductor/core/execution/DeciderService.java	87.73% <100%> (+0.11%)	109 <1> (+1)	⬆️
...ductor/core/utils/ExternalPayloadStorageUtils.java	77.77% <0%> (+4.93%)	14% <0%> (+1%)	⬆️

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