Error improvements

[RiccardoM]

Description

This PR improves the errors usage (closes #237).

Closes #234

Checklist

• Targeted PR against correct branch.
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Wrote unit tests.
• Wrote integration tests (simulation & CLI).
• Updated the documentation.
• Added an entry to the CHANGELOG.md file.
• Re-reviewed Files changed in the Github PR explorer.

[codecov]

Codecov Report

Merging #238 into master will decrease coverage by 0.01%.
The diff coverage is 84.21%.

@@            Coverage Diff             @@
##           master     #238      +/-   ##
==========================================
- Coverage   84.80%   84.79%   -0.02%     
==========================================
  Files          80       80              
  Lines        2896     2894       -2     
==========================================
- Hits         2456     2454       -2     
  Misses        377      377              
  Partials       63       63              

Impacted Files	Coverage Δ
x/magpie/keeper/handler.go	81.25% <0.00%> (ø)
x/reports/keeper/handler.go	86.95% <0.00%> (ø)
x/posts/types/msgs/msgs.go	90.76% <71.42%> (+0.14%)	⬆️
x/magpie/types/msgs.go	96.00% <100.00%> (ø)
x/posts/types/msgs/msg_reactions.go	95.45% <100.00%> (ø)
x/posts/types/msgs/msgs_polls.go	100.00% <100.00%> (ø)
x/posts/types/msgs/msgs_post_reactions.go	100.00% <100.00%> (ø)
x/profiles/types/msgs.go	100.00% <100.00%> (ø)
x/reports/types/models/report.go	100.00% <100.00%> (ø)
x/reports/types/msgs/msgs.go	93.75% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c5b43c5...ecd3fe2. Read the comment docs.

[leobragaz]

looks good! 👍