fixed bug in color.py

1 files changed, 6 insertions, 5 deletions

diff --git a/lib/param/color.py b/lib/param/color.py
index 096a1e8..02d694d 100644
--- a/lib/param/color.py
+++ b/lib/param/color.py
@@ -9,11 +9,12 @@ class Color(Param):
     """
     def __init__(self, value, classname=""):
         super(Color, self).__init__(classname=classname)
-        try:
-            self.value = self._color_sanitize(value)
-        except Exception as e:
-            self.err_warn("Unable to sanitize the color: %s" % str(value))
-            self.err_warn(str(e))
+        if value:
+            try:
+                self.value = self._color_sanitize(value)
+            except Exception as e:
+                self.err_warn("Unable to sanitize the color: %s" % str(value))
+                self.err_warn(str(e))
     def _color_sanitize(self, s):
         if s == "":
             return "transparent"