Fix(Cancel): Add check for empty provider locator on cancel requests
If Cancel request is missing provider locator data, return 207 error (Request XML not accepted by supplier).
Sellers at 2023-05-04:
- Abbey Tours - [ABT]
- ASA London - [ASA]
- Flying Europe - [FLEU]
- TourPlan - [TPN]
- Asa Tours - [ASAT]
- AC Tours Group - [ACG]
- Eurotur - [EURT]
- Res Solutions - [RSOL]
- TourEast (Tourplan) - [TPET]
- Tahiti Nui Travel - [TTI]
- Exo Travel - [EXO]
- Private Safaris - [PSAF]
- Diethelm - [DTH]
- Axis Globe - [AXS]