fix bug where fallback was not working if first ad element return empty

[Rapha0511]

Description

https://github.com/dailymotion/vast-client-js/blob/master/src/parser/vast_parser.js#L461C25-L461C25

The condition will never be reach since !resolvedAds will always be false. So in case the first Ad element of a VAST is empty or it fails, it will never fallback to the next Ad element.

Issue

If any Ad element (going from top to bottom) fails to fetch xml or return empty vast, it will not fallback to next Ad Element.

Issue Link

Type

• [ ] Breaking change
• [ ] Enhancement
• [X] Fix
• [ ] Documentation
• [ ] Tooling

[shubham-si]

@ZacharieTFR @Rapha0511 when we are planning to release this fix