[california] Improved error message with DateTime parsing

[Jim Nelson <jnelson src gnome org>]

commit 2252d1bcb2356af1bcda53a9f2c4142b4e26f01a
Author: Jim Nelson <jim yorba org>
Date:   Thu Jul 17 13:02:07 2014 -0700

    Improved error message with DateTime parsing
    
    This is to assist debugging bug #733319.

 src/component/component-date-time.vala |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/component/component-date-time.vala b/src/component/component-date-time.vala
index 1ad627c..0f557f7 100644
--- a/src/component/component-date-time.vala
+++ b/src/component/component-date-time.vala
@@ -92,7 +92,8 @@ public class DateTime : BaseObject, Gee.Hashable<DateTime>, Gee.Comparable<DateT
             break;
             
             default:
-                throw new ComponentError.INVALID("Not a DATE/DATE-TIME value: %s", 
prop_value.isa().to_string());
+                throw new ComponentError.INVALID("%s not a DATE/DATE-TIME value: %s",
+                    prop.isa().to_string(), prop_value.isa().to_string());
         }
         
         if (iCal.icaltime_is_null_time(dt) != 0)