COMP: Dead code

Coverity detected three defects:
Code after exceptions cannot be reached.
m_Orientation was not being initialized.
Failed to check function for zero return that might cause divide by 0.

Change-Id: I9d4a349a6f82e6ce4f148ebb5a95d348f7a4fa9e
Merge topic 'Coverity_itkTIFFImageIO'

1380b1c COMP: Dead code