From 4d59059612548f296b9cb066f5df61056d7841d9 Mon Sep 17 00:00:00 2001
From: Chris Toomey <chris@ctoomey.com>
Date: Tue, 27 Nov 2012 22:29:40 -0500
Subject: [PATCH] Guard against empty command string

---
 plugin/vim-tmux-runner.vim | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/plugin/vim-tmux-runner.vim b/plugin/vim-tmux-runner.vim
index 1f9155e..9e26eb9 100644
--- a/plugin/vim-tmux-runner.vim
+++ b/plugin/vim-tmux-runner.vim
@@ -254,6 +254,12 @@ function! s:SendCommandToRunner()
     if !exists("s:user_command")
         let s:user_command = s:HighlightedPrompt(g:VtrPrompt)
     endif
+    let escaped_empty_string = "''"
+    if s:user_command == escaped_empty_string
+        unlet s:user_command
+        echohl ErrorMsg | echom "VTR: command string required" | echohl None
+        return
+    endif
     call s:EnsureRunnerPane()
     if g:VtrClearBeforeSend
         call s:SendClearSequence()