...introduced with 75bc673b60 "Travelled MIME type
through UCB for CMIS UCP to use it when creating documents" and causing crashes
in sc_unoapi test. Many SfxMedium instances appear to have a null filter, so
this workaround at least fixes the crashes. No idea what a good fix should look
like, so will ask Cedric to review his commit.
Change-Id: I27180265b6c79c7ed5f459b03c9e188ff6a0f56d