Handle 'Empty Raised' with the correct exception. Exception should be 'Failed to start all workers' instead.
<rdar://problem/98686178>
Pull request: https://github.com/WebKit/WebKit/pull/3320
New PR: https://github.com/WebKit/WebKit/pull/3323
Committed 253499@main (50daba6f8f91): <https://commits.webkit.org/253499@main> Reviewed commits have been landed. Closing PR #3323 and removing active labels.
Committed 252432.270@safari-7614-branch (0c122a63710b): <https://commits.webkit.org/252432.270@safari-7614-branch> Reviewed commits have been landed. Closing PR #33 and removing active labels.