Minecraft no longer prints an error to the game log when trying to render a character without a defined glyph in the loaded fonts

Relates to: MC-236295 MC-263121 MC-276750 MC-276751

The bug

If no active resource pack defines a texture for a given character, it will correctly render as a rectangle, however no error will be reported in the console. This is unlike what happens for missing textures.

Notably, the game did report these errors in 1.13 pre-releases 6 and 7, but this functionality appears to have broken in pre-release 8 onwards.

How to reproduce

1. Paste this character into chat: 
2. Observe the log output

Expected results

Couldn't find glyph for character  (\uf8ff)

Actual results

No error is produced at all.

How to fix

Make this error show up again.