[O] org-element cache and LAST_REPEAT

[Michael Brand]

Hi Nicolas

With today's release_8.2.5h-676-gfb8a042 and C-c C-t on the todo
below, the last headline gets corrupted. Only when cache is enabled.

----------------------------------------------------------------------
* bla
:PROPERTIES:
:bla:      bla
:END:
* TODO bla
SCHEDULED: <2014-03-04 Tue +1d>
:PROPERTIES:
:LAST_REPEAT: [2014-03-04 Tue 12:00]
:LOGGING:  logrepeat
:END:
* bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
----------------------------------------------------------------------

Michael