Don't print error if no color string is parsed.

diff --git a/src/utils/colors.cc b/src/utils/colors.cc
index cf53bfc..de705d0 100644 (file)
--- a/src/utils/colors.cc
+++ b/src/utils/colors.cc
@@ -26,6 +26,7 @@ Color::Color(const string & color_str)
 string Color::parse(const string & value)
 {
   static map<string, string> str2esc = {
+    { "",              ""                      },      // no color
     { "green",         COLOR_GREEN             },
     { "lightgreen",    COLOR_GREEN_LIGHT       },
     { "red",           COLOR_RED               },