Tolerates html only content in neutral question comments
Tolerates html only content in neutral question comments

Resolves unshown comment problem which arises when comments are blank
and html comments are not.

Closes CNVS-20614

Test Plan:
  - Build question which only has html neutral comments.
  - Confirm that the neutral comments are shown.

Change-Id: Iaed575fed5fbc3a3f144dec57d1fbd37ce9082b0
Reviewed-on: https://gerrit.instructure.com/55837
Tested-by: Jenkins
Reviewed-by: Brian Finney <6d3e3f1a68388efca72d0ac9c9ecbc1039d2a9c2@instructure.com>
QA-Review: Michael Hargiss <59e3fde81b8d9a4f5e0cc016a3c2695591912604@instructure.com>
Product-Review: Ryan Taylor <2eafa1f6bf34395b543d6ca7f438461b0774d24f@instructure.com>

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