avoid drawing empty graph

diff --git a/graph b/graph
index 096586e9e04547e1c59d6db804f938a7e28124db..fc659e1ec79c06629daac5ca37e968c8c5f90741 100755 (executable)
--- a/graph
+++ b/graph
@@ -61,7 +61,7 @@ for my $nr (0 .. $#lines) {
                print "\e[0m" if $color;
        }
        printf '%-*s', $len, $lines[$nr];
-       print $barmark[$_] // '-' for 1 .. (($val || 0) - $minval) * $size;
+       print $barmark[$_] // '-' for 1 .. $size && (($val || 0) - $minval) * $size;
        say '';
 }