From ff6de24eeded17d1773a62da046dd08c2895dc89 Mon Sep 17 00:00:00 2001
From: Ahmad Humayun <ahmad.humyn@gmail.com>
Date: Sun, 2 Jul 2017 23:44:23 -0400
Subject: [PATCH] Fixed no help message bug for CmdLine

Commit 2c85c1f improved CmdLine help message formatting - but it started
crashing when no help message was given. This problem is fixed in this
commit.
---
 CmdLine.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CmdLine.lua b/CmdLine.lua
index a9aa6609..a53a0b3f 100644
--- a/CmdLine.lua
+++ b/CmdLine.lua
@@ -19,7 +19,7 @@ local function block_txt(str, pre_pad, block_sz)
    local start_i = 0
    local end_i = 0
 
-   while end_i do
+   while end_i and str do
       -- start search for text ahead of previous last position
       start_i = end_i + 1
       -- newline if the string already has text