Fix(Avail) : fix null reference if AgeRange parameter not in configuration
Refactor AgeRange treatment in Avail, Quote, Book Refactor count pax type in Avail, Quote, Book Update explanation AgeRange parameter in configuration and pattern
Closes ITPN-260
Sellers at 2021-12-31:
- Private Safaris - [PSAF]
- ASA London - [ASA]
- Tahiti Nui Travel - [TTI]
- Asa Tours - [ASAT]
- Abbey Tours - [ABT]
- Res Solutions - [RSOL]
- Exo Travel - [EXO]
- AC Tours Group - [ACG]
- Eurotur - [EURT]
- TourEast (Tourplan) - [TPET]
- Flying Europe - [FLEU]
- TourPlan - [TPN]