core/validatorapi: omit if empty on the proposer config

[ciaranmcveigh5]

• omit if empty on propser config overrides currently getting -,"builder":{"enabled":false,"registration_overrides":null}

category: feature
ticket: #849

[codecov]

Codecov Report

Merging #975 (60fc856) into main (b42075f) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #975      +/-   ##
==========================================
+ Coverage   54.14%   54.19%   +0.04%     
==========================================
  Files         116      116              
  Lines       12750    12750              
==========================================
+ Hits         6904     6910       +6     
+ Misses       4830     4826       -4     
+ Partials     1016     1014       -2     

Impacted Files	Coverage Δ
core/validatorapi/teku.go	0.00% <ø> (ø)
core/dutydb/memory.go	70.63% <0.00%> (-1.28%)	⬇️
app/app.go	58.80% <0.00%> (+1.79%)	⬆️

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