rstudio/shiny — pull request #492 by jcheng5 (2014-05-22 02:54:37+00:00)
Title: Miscellaneous bug fixes

- `NULL` was printing at the console after most `renderPrint` operations, this was a new bug since 0.9.
- When `renderPrint` returns without plotting anything, on Linux it rendered as a big black rectangle.
- When a validation error occurs then is followed by a regular error without an intervening successful value, the regular error is styled like a validation error (grey instead of red).