Related: #i124661# crash when loading and re-saving ppt file...

with a single customshape

check the equation array element number. If the number is greater than 128, the
equation array will not be imported.

(cherry picked from commit 48653aa3a1cc24ed9ad8a14ae035b38a751e561d)

Conflicts:
	filter/source/msfilter/msdffimp.cxx

Change-Id: I49ac6ec5610a7761ca3ed4905d6fe1bc7ec079d0