fix black listed addrs bug in bank

[colin-axner]

fixes #104

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• Reviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[alexanderbez]

ACK

[codecov-io]

Codecov Report

Merging #105 into master will increase coverage by 0.43%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   67.31%   67.74%   +0.43%     
==========================================
  Files           3        3              
  Lines         462      462              
==========================================
+ Hits          311      313       +2     
+ Misses        120      118       -2     
  Partials       31       31