What's Changed
* BUGFIX: where if buffer is already closed (e.g. graph windows closed by user), when the clean up action occurs, it would throw an uncaught exception sending the sentinel to each dataprocessor. by peads in https://github.com/peads/sdrterm/pull/32
**Full Changelog**: https://github.com/peads/sdrterm/compare/v0.2.3...v0.2.3.1