rtd: fall back to global routing for unknown bidders

[MO-Thibault]

Summary

• When a bidder route from defaultEIDSources doesn't exist in the current auction, route EIDs globally instead of creating phantom bidder entries

Problem

defaultEIDSources maps EID sources to specific bidders (e.g. smartadserver.com → smartadserver). When those bidders don't exist in the publisher's Prebid config, the RTD module creates new entries in ortb2Fragments.bidder for non-existent bidders. Prebid.js then generates eidpermissions with "bidders": [], and PBS rejects the request:

Invalid request: request.ext.prebid.data.eidpermissions[0]
missing or empty required field: "bidders"

Affected customers: Unwind, Arena, MediaCo, MyCode, DDM — any publisher using ID5 enrichment where the enriched EID sources (smartadserver, gumgum, triplelift, etc.) don't match their PBS bidder config.

Fix

One-line change in the merge phase of handleRtd(): check route in reqBidsConfigObj.ortb2Fragments.bidder before merging per-bidder. Unknown bidders fall back to global routing.

Before: blindly creates ortb2Fragments.bidder[route] → phantom bidder → empty eidpermissions → PBS error

After: only merges to existing bidders; unknown routes merge to ortb2Fragments.global → EIDs available to all bidders, no phantom entries

Test plan

• Build succeeds
• Existing tests pass
• With defaultEIDSources and a publisher missing smartadserver bidder: no eidpermissions with empty bidders in PBS payload
• EIDs for unknown bidders appear in global user.ext.eids instead

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