Defer "no such release config" error

This allows product-specific release config maps to declare release
configs.

Bug: 328495189
Test: manual
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:6012518e1ff5a4b3c30e159e2a3eacda4ef3a8cf)
Merged-In: I862f167062ee647af00a4ec7d4af2966c6be44a8
Change-Id: I862f167062ee647af00a4ec7d4af2966c6be44a8