During loading of the emoji_characters.xml file Warnings are reported to log file

[fmartian]

Environment

Kokua 7.2.1, but same happens with Second Life Release 7.2.1.17108480561 (64bit)

Description

While doing some debugging on Kokua for other work I also looked through the logged warnings and attempted to squash some of them. I then discovered that the viewer reports the first 26 characters in the emoji file as ignored since they do not contain a category entry. This seems wrong to me.
Either those characters should not be in the xml file, or they should contain a category to which they are assigned, or the Viewer should add them to the "other" category as it does with listed categories it can't find in the previously loaded category list.
I'm not sure which of these options is the most desirable and would like some feedback about this before I try to produce a PR.

Reproduction steps

1. Start Viewer
2. Check the debug log file for
   WARNING # llui/llemojidictionary.cpp(396) LLEmojiDictionary::loadEmojis : Skipping invalid emoji descriptor (no categories)

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