Prebid chain of events are not occurring in case of only 1x1 adunit mapped with paapi

[Amark19]

Type of issue

Bug

Description

When only 1x1 is enabled for a certain ad unit and paapi is also enabled, a reduce operation in the getSizes function within paapi.js throws an error, which prevents Prebid to continue with auction and following events.

Steps to reproduce

1. Map a 1x1 size to a adunit.
2. Enable paapi under pbjs.setConfig()
3. Refresh the page.
   3.1 Reduce method on empty array caught in line
   
   3.2 You can see no events after auctionDebug are firing.
   

Test page

Js fiddle Link :- https://jsfiddle.net/as4bngdq/

Expected results

• Ideally all events should fire and auction should start.

Actual results

• No events firing after auctionDebug .

Platform details

Prebid 9.12.0, Chrome Desktop

Other information

PR when breaking change started :- #11379