jcfaria/Vim-R-plugin — pull request #146 by mdlerch (2014-12-08 17:28:21+00:00)
Title: Check if map exists before trying to unmap it.

If ds is not mapped even though vim-surround is loaded (perhaps one has
custom mappings), then when the rbrowser is started an annoying error
pops up. Check if ds mapping exists before trying to unmap it.