Handle promise rejections

[umarmughal824]

Pre-Flight checklist

• Testing
  • Code is tested
  • Changes have been manually tested

What are the relevant tickets?

fixes #4934

What's this PR do?

Handle promise rejections on the /dashboard page

How should this be manually tested?

Just visit the dashboard page and see everything is functional

[codecov-commenter]

Codecov Report

Merging #4983 (ada776c) into master (6709ecb) will not change coverage.
The diff coverage is 100.00%.

❗ Current head ada776c differs from pull request most recent head d899e95. Consider uploading reports for the commit d899e95 to get more accurate results

@@           Coverage Diff           @@
##           master    #4983   +/-   ##
=======================================
  Coverage   94.14%   94.14%           
=======================================
  Files         496      496           
  Lines       22834    22834           
  Branches      916      916           
=======================================
  Hits        21496    21496           
  Misses       1242     1242           
  Partials       96       96           

Impacted Files	Coverage Δ
static/js/containers/DashboardPage.js	86.96% <100.00%> (ø)

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[annagav]

👍