Fix possible exception when retrieving reminder

Fixes #2624

NEWS

@@ -10,6 +10,7 @@ Bug fixes
  - fixed unsubscription when renaming an IMAP folder (#2630)
  - fixed sorting of events list by calendar name (#2629)
  - fixed wrong date format leading to Android email syncing issues (#2609)
+ - fixed possible exception when retrieving the default event reminder value (#2624)
 
 2.2.0 (2014-02-24)
 ------------------

UI/PreferencesUI/UIxPreferences.m

@@ -571,10 +571,13 @@ static NSArray *reminderValues = nil;
   int index;
 
   value = [userDefaults calendarDefaultReminder];
-  index = [reminderValues indexOfObject: value];
+  if (value != nil)
+    {
+      index = [reminderValues indexOfObject: value];
 
-  if (index != NSNotFound)
-    return [reminderItems objectAtIndex: index];
+      if (index != NSNotFound)
+        return [reminderItems objectAtIndex: index];
+    }
  
   return @"NONE";
 }