Remove special case which is handled differently now

Since 3914a711060341345f15b83656457f90095f32d6 rGrfName is empty.

It was added in 363f1c1462963f6f032de07649dc9c4d02b4e446

Change-Id: I4ec3b432399708db4acb6af1af69df4c0aaa181c
Better to throw than crash, if token handler is not set.

Change-Id: If6b2d39b487b5f673d5b6b2945a6e7d08777594e
fastparser: Use dummy token handler in unit test instead of an oox one.

Change-Id: I4562156858982857a17e8837106c4c946f175be7