Committer Finder should attempt to resolve all users before reporting failure for one

[sehaswell]

Committer finder returns early upon finding a user with no e-mail, without attempting to resolve the e-mails of other users.
This proposed unit test for committerFinder shows this:

// TODO: do we need to get info on both users at once?
// committerFinder exits after finding a missing e-mail  - is missing e-mail likely, or even possible?
it("will inform us about multiple unresolved users if they are unresolvable in different ways", async function() {
   let unresolvableMocks = {};
   unresolvableMocks.gitlabRequest = gitlabApiMocks.gitlabRequest;
   unresolvableMocks.getCommits = function(projectId, mergeRequestId) {
     return [noEmailBobCommit, unmappedEmailCommit];
   };
   unresolvableMocks.getUserInfo = gitlabApiMocks.getUserInfo;

   mock("../src/gitlabApi", unresolvableMocks);
   const committerFinder = mock.reRequire("../src/committerFinder");
   let response = await committerFinder(
     goodProjectId,
     goodMergeRequestId,
     goodGitlabToken
  );

  let expectedResponse = {
    unresolvedLoginNames: [noEmailBobCommit.author_name, unmappedEmailCommit.author_name],
    distinctUsersToVerify: []
   };

   expect(response).toEqual(expectedResponse);
});