Crashes when editing email

[chrisc30]

Installed latest Beam from Haiku Depot. Can edit preferences fine including TO: and Subject: but when editing emails hitting backspace in the message field crashes the app.

[chrisc30]

I made some changes here and it no longer crashes when hitting backspace.

https://github.com/chrisc30/Beam/blob/11838aa0bf157aa3eb994de4fa999d438dddeaf1/src-bmGuiBase/WrappingTextView.cpp