fix: Do not crash on e.g. dmenu < /dev/null - dmenu - dynamic menu
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       ---
 (DIR) commit 76eb5783046cf89ba6b7e9f8cdab35fe86d07a82
 (DIR) parent 44c7de3dcf49ee568863f55610f40c7a05b4dfe7
 (HTM) Author: S. Gilles <sgilles@math.umd.edu>
       Date:   Tue, 28 Jun 2016 01:11:50 -0400
       
       fix: Do not crash on e.g. dmenu < /dev/null
       
       Diffstat:
         M dmenu.c                             |       2 +-
       
       1 file changed, 1 insertion(+), 1 deletion(-)
       ---
 (DIR) diff --git a/dmenu.c b/dmenu.c
       @@ -480,7 +480,7 @@ readstdin(void)
                }
                if (items)
                        items[i].text = NULL;
       -        inputw = TEXTW(items[imax].text);
       +        inputw = items ? TEXTW(items[imax].text) : 0;
                lines = MIN(lines, i);
        }