Ouch, don't crash when updating an object (e.g. contact) while the kmail folder

holding it isn't open.
With thanks to valgrind as always.

svn path=/branches/proko2/kdepim/; revision=338706

kmailicalifaceimpl.cpp

@@ -799,6 +799,8 @@ Q_UINT32 KMailICalIfaceImpl::update( const QString& resource,
     kdError(5006) << "update(" << resource << ") : Folder has wrong storage format " << storageFormat( f ) << endl;
     return rc;
   }
+
+  f->open();
   bool quiet = mResourceQuiet;
   mResourceQuiet = true;
 
@@ -859,6 +861,8 @@ Q_UINT32 KMailICalIfaceImpl::update( const QString& resource,
                             attachmentMimetypes );
   }
 
+  f->close();
+
   mResourceQuiet = quiet;
   return rc;
 }