Explicitly fail when there're no registered revealers.
Explicitly fail when there're no registered revealers.

Otherwise Promise.race([]) returns a pending promise:)

Bug: 1376495
Change-Id: I831e6961a774da042a1cd2fd190d07152f5fcc9f
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3966431
Commit-Queue: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>
Auto-Submit: Danil Somsikov <f16a5ee11618cab93684e694f9aa762d34f02920@chromium.org>
Commit-Queue: Danil Somsikov <f16a5ee11618cab93684e694f9aa762d34f02920@chromium.org>
Reviewed-by: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend