[fix?] discard empty tags in Taggable mixin

[aaxelb]

Purpose

Changes

QA Notes

Please make verification statements inspired by your code and what your code touches.

• Verify
• Verify

What are the areas of risk?

Any concerns/considerations/questions that development raised?

Documentation

Side Effects

Ticket

[Johnetordoff]

We might not get to this fix for a while so here's a screenshot to document where this issue is occurring.