[evolution] Remove an unused calendar error message.

[Matthew Barnes <mbarnes src gnome org>]

commit 8adb5b55ca8e2923b25f7a4a47d0f80a21c472b8
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sat Feb 23 09:27:05 2013 -0500

    Remove an unused calendar error message.

 calendar/calendar.error.xml |    7 -------
 1 files changed, 0 insertions(+), 7 deletions(-)
---
diff --git a/calendar/calendar.error.xml b/calendar/calendar.error.xml
index 3ca7590..d506a21 100644
--- a/calendar/calendar.error.xml
+++ b/calendar/calendar.error.xml
@@ -288,13 +288,6 @@
     <secondary>{1}</secondary>
   </error>
 
-  <error id="online-operation" type="error">
-    <!-- Translators: {0} is replaced with a group name, like CalDAV, Google, or such;
-     {1} is replaced with a calendar/task/memo list name, where the error happened -->
-    <_primary>Could not perform this operation on '{0}: {1}'.</_primary>
-    <_secondary>You must be working online to complete this operation.</_secondary>
-  </error>
-
   <error id="search-error-generic" type="error">
     <secondary>{0}</secondary>
   </error>