Fix demographics

[adelavega]

Fix #986

Bug in computing mean age caused all ages to be displayed as n/a

[cypress]

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Test summary

7 • 0 • 0 • 0 • 1

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Run details

Project	Neuroscout
Status	Passed
Commit	ed86730
Started	Sep 28, 2021 7:56 PM
Ended	Sep 28, 2021 7:58 PM
Duration	02:06 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 87

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/integration/analysis_builder.spec.js		1
1	Analysis Builder > analysis builder

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This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard

[cypress]

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Test summary

7 • 0 • 0 • 0 • 1

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Run details

Project	Neuroscout
Status	Passed
Commit	90a9f18 ℹ️
Started	Sep 28, 2021 7:58 PM
Ended	Sep 28, 2021 8:00 PM
Duration	01:58 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 87

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/integration/analysis_builder.spec.js		1
1	Analysis Builder > analysis builder

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This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard

[codecov-commenter]

Codecov Report

Merging #989 (ed86730) into master (8511c4f) will decrease coverage by 0.16%.
The diff coverage is 9.09%.

@@            Coverage Diff             @@
##           master     #989      +/-   ##
==========================================
- Coverage   78.58%   78.41%   -0.17%     
==========================================
  Files          63       63              
  Lines        3231     3238       +7     
==========================================
  Hits         2539     2539              
- Misses        692      699       +7     

Impacted Files	Coverage Δ
neuroscout/models/dataset.py	71.15% <9.09%> (-11.07%)	⬇️

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