feat(BUX-227): npe if broadcast returned an empty response

[witalij-4chain]

No description provided.

[codecov]

Codecov Report

Merging #398 (60fa42e) into master (82bbc83) will decrease coverage by 0.03%.
The diff coverage is 16.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #398      +/-   ##
==========================================
- Coverage   51.96%   51.93%   -0.03%     
==========================================
  Files          92       92              
  Lines       10683    10688       +5     
==========================================
  Hits         5551     5551              
- Misses       4698     4702       +4     
- Partials      434      435       +1     

Flag	Coverage Δ
unittests	51.93% <16.66%> (-0.03%)	⬇️

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Files Changed	Coverage Δ
chainstate/broadcast_providers.go	44.64% <16.66%> (-4.38%)	⬇️

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[mrz1836]

LGTM