lost connection when chat only fullwidth space

[tomo1560]

lost connection when chat only full-width space ("　") use version：waterfall#290 console log：https://pastebin.com/JZ94cpj1 image：

[Black-Hole]

This seems to be designed this way: https://github.com/PaperMC/Waterfall/blob/master/BungeeCord-Patches/0024-Validate-that-chat-messages-are-non-blank.patch

[electronicboy]

This is intentional, not 100% on why it was done, but there is a good chance that it was treated differently in older client versions than it is now and thus made sense to prevent other issues

[Janmm14]

Should be changed probably to only check is empty in higher client versions.