Chris Toomey 8399c4ab7b Ensure runner_pane is valid before using
This protects all commands that expect a runner pane from runner
against an invalid pane, including the Vim pane. Since the user can
modified the tmux layout and open and close panes outside the context
of VTR, it's neccesary to check this before any command that requires
the runner pane.

Closes #28 - Protect against running command against invalid panes
2014-12-31 14:45:28 -05:00
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