Fix: error during post creation in discussion MFE sidebar (#751)

[zameel7]

Description

This check for post fixes the issue that is caused in the new MFE discussion sidebar as mentioned in #751

How Has This Been Tested?

Before the change, I was seeing an error after creating a new post, but now it clears the current post data from the form and submits that.

Post-merge Checklist

• Deploy the changes to prod after verifying on stage or ask @openedx/edx-infinity to do it.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.17%. Comparing base (58aa512) to head (80b8279).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #752   +/-   ##
=======================================
  Coverage   93.17%   93.17%           
=======================================
  Files         161      161           
  Lines        3401     3401           
  Branches      924      923    -1     
=======================================
  Hits         3169     3169           
  Misses        214      214           
  Partials       18       18           

☔ View full report in Codecov by Sentry.
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[e0d]

@zameel7 I notice there are some commit-lint failures. Please note that we use conventional commits across Open edX projects. You can read about the details here. Can you please amend your commit messages to follow our standard?

[zameel7]

@e0d, sorry I missed that. Fixed that now.

[mphilbrick211]

Hi @openedx/2u-infinity - this is ready for review. Thanks!

[mphilbrick211]

Hi @openedx/2u-infinity - this is ready for review. Thanks!

@openedx/2u-infinity friendly ping on this!