Fix inheritance issue

[ferblape]

Unexpected

What does this PR do?

This PR fixes this Rollbar

https://rollbar.com/fernando/gobierto/items/362/?item_page=0&#instances

[codecov-io]

Codecov Report

Merging #634 into stable will decrease coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           stable     #634      +/-   ##
==========================================
- Coverage   67.57%   67.52%   -0.05%     
==========================================
  Files         298      298              
  Lines        7302     7301       -1     
==========================================
- Hits         4934     4930       -4     
- Misses       2368     2371       +3

Impacted Files	Coverage Δ
...rto_people/people/past_person_events_controller.rb	0% <0%> (ø)	⬆️
app/models/gobierto_budgets/budget_line_stats.rb	84.5% <0%> (-2.82%)	⬇️
app/models/gobierto_budgets/site_stats.rb	76.38% <0%> (-2.78%)	⬇️

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