Fix (Booking): add control for null prices
Add control for null prices to avoid uncontroled excepsions while parsing suplier responses
Sellers at 2023-03-20:
- Tower - [TWR]
- AlbaTravel Group - [ALB]
- Italian Escapade - [ITL]
- Brillandia - [BRI]
- AIC Travel Group - [AIC]
- MyGo - [MYGO]
- Magica Italia Travel - [MAI]
- One Up Travel - [OUT]
- Netstorming Connector - [NSTC]
- Blu Welcome Travel - [BLW]