MM-52722: Fixed error when accessing property on undefined

[srisri332]

Summary

The red JavaScript banner was due an error that was occurring when a property was trying to be accessed on undefined. This undefined value occurs only when empty lines are given in the comments box. Therefore, placed a check to not do this if there are no text values in the comment box.

Testing: check the following issue link to follow the steps to reproduce: https://github.com/mattermost/focalboard/issues/4831 Also, do a basic sanity test to see if the comment box functionality is working as expected.

Ticket Link

https://github.com/mattermost/focalboard/issues/4831 https://mattermost.atlassian.net/browse/MM-52722

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