#2174453 - Fix EntityMetadataWrapperException caused when loop through line items that don't have a commerce_product reference as fee, coupon, etc.
#1998848 - Created rooms_options_default and rooms_options_admin formatters so when rooms_options line item field is displayed in a line items view the rooms options displays correctly. As no formmaters exists for field type rooms_options the field displayed empty.
Better handling of the error case where a booking may be saved without unit type.
Revert "Better handling of the error..." Pushed to wrong branch. Sorry.

This reverts commit 9f1c0dfe81856b166c5d94489bb53995be7bb3c2.
Merge pull request #34 from BluesparkLabs/ROOMS-139

Fixes for D.O. issues #2174453 and #1998848