SO-4882: Upgrade empty extension bug

[molnarlaura]

No description provided.

[codecov-commenter]

Codecov Report

Merging #849 (a48ea74) into 7.x (f097b89) will increase coverage by 0.01%.
The diff coverage is 92.00%.

@@             Coverage Diff              @@
##                7.x     #849      +/-   ##
============================================
+ Coverage     62.30%   62.32%   +0.01%     
- Complexity    11339    11345       +6     
============================================
  Files          1610     1610              
  Lines         54819    54834      +15     
  Branches       5434     5437       +3     
============================================
+ Hits          34155    34173      +18     
+ Misses        18461    18455       -6     
- Partials       2203     2206       +3     

Impacted Files	Coverage Δ
...ystem/CodeSystemUpgradeSynchronizationRequest.java	93.54% <ø> (+11.73%)	⬆️
...national/index/revision/BaseRevisionBranching.java	90.64% <92.00%> (+4.27%)	⬆️
...x/src/com/b2international/index/util/JsonDiff.java	75.29% <0.00%> (-2.36%)	⬇️
...onal/snowowl/snomed/core/tree/TerminologyTree.java	80.76% <0.00%> (-1.93%)	⬇️
.../b2international/index/es/client/EsClientBase.java	65.47% <0.00%> (-1.20%)	⬇️
...src/com/b2international/index/revision/Commit.java	60.95% <0.00%> (-0.69%)	⬇️
.../snomed/core/ecl/SnomedEclRefinementEvaluator.java	89.01% <0.00%> (-0.22%)	⬇️

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[lgtm-com]

This pull request introduces 1 alert when merging d3309fd into f097b89 - view on LGTM.com

new alerts:

• 1 for Spurious Javadoc @param tags

[cmark]

LGTM!