Fix for missing delete in case of exception.

[optout21]

Description

Fix for low-prob. minor memory leak, delete[] was missing in a catch branch. Fixes #1286 .

Testing instructions

Unit tests.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist

• Prefix PR title with [WIP] if necessary.
• Add tests to cover changes as needed.
• Update documentation as needed.
• I have read the guidelines for adding a new blockchain
• If there is a related Issue, mention it in the description (e.g. Fixes #<issue_number> ).

[codecov]

Codecov Report

Merging #1291 (f8d9892) into master (efc454c) will decrease coverage by 0.02%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #1291      +/-   ##
==========================================
- Coverage   95.31%   95.28%   -0.03%     
==========================================
  Files         433      433              
  Lines       13172    13121      -51     
==========================================
- Hits        12555    12503      -52     
- Misses        617      618       +1     

Impacted Files	Coverage Δ
walletconsole/lib/Util.cpp	89.74% <50.00%> (-2.26%)	⬇️
src/Bitcoin/CashAddress.cpp	82.22% <0.00%> (-2.40%)	⬇️
src/interface/TWStoredKey.cpp	91.57% <0.00%> (-1.06%)	⬇️
src/NEO/Witness.h	85.71% <0.00%> (-0.96%)	⬇️
src/NEO/Address.cpp	77.77% <0.00%> (-0.80%)	⬇️
src/NEO/ReadData.cpp	76.66% <0.00%> (-0.76%)	⬇️
src/Algorand/Address.cpp	87.09% <0.00%> (-0.41%)	⬇️
src/Stellar/Address.cpp	88.88% <0.00%> (-0.31%)	⬇️
src/Nimiq/Address.cpp	91.30% <0.00%> (-0.25%)	⬇️
src/EOS/Asset.cpp	84.61% <0.00%> (-0.24%)	⬇️
... and 29 more

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