fix: missing pce when coming from client connect

This MR fixes the case when the PCE is empty and stop the process is no pce is provided

When launching the new connector with client connect account, and if no new PCE is applied (automatic launch), the one from client connect is used.

https://forge.grandlyon.com/web-et-numerique/factory/llle_project/grdf-konnector/-/blob/v1.3.1/konnector-dev-config.example.json

If both pce are provided, the one from the fields is used