Return empty object instead of array

[spkjp]

Proposed changes

Return an empty object to match the type of walletsByAddress.

Types of changes

• Bugfix (non-breaking change which fixes an issue)

Checklist

• Lint and unit tests pass locally with my changes

[codecov-io]

Codecov Report

Merging #929 into develop will not change coverage.
The diff coverage is 50%.

@@           Coverage Diff            @@
##           develop     #929   +/-   ##
========================================
  Coverage    51.65%   51.65%           
========================================
  Files          432      432           
  Lines         7200     7200           
  Branches       924      924           
========================================
  Hits          3719     3719           
  Misses        3049     3049           
  Partials       432      432

Impacted Files	Coverage Δ
packages/core-database-sequelize/lib/connection.js	73.41% <50%> (ø)	⬆️

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[codecov-io]

Codecov Report

Merging #929 into develop will decrease coverage by 0.02%.
The diff coverage is 50%.

@@             Coverage Diff             @@
##           develop     #929      +/-   ##
===========================================
- Coverage    51.65%   51.62%   -0.03%     
===========================================
  Files          432      432              
  Lines         7200     7200              
  Branches       924      924              
===========================================
- Hits          3719     3717       -2     
- Misses        3049     3050       +1     
- Partials       432      433       +1

Impacted Files	Coverage Δ
packages/core-database-sequelize/lib/connection.js	73.41% <50%> (ø)	⬆️
packages/crypto/lib/models/transaction.js	61.76% <0%> (-0.99%)	⬇️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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