message: Handle 404 and 400 in historian wrapper.
diff: @@ -71,7 +71,8 @@ export class Historian implements IHistorian {
  public getCommits(sha: string, count: number): Promise<git.ICommitDetails[]> {
  return this.restWrapper.get<git.ICommitDetails[]>(`/commits`, { count, sha })
  - .catch((error) => error === 400 ? [] as git.ICommitDetails[] : Promise.reject<git.ICommitDetails[]>(error));
  + .catch((error) => (error === 400 || error === 404) ?
  + [] as git.ICommitDetails[] : Promise.reject<git.ICommitDetails[]>(error));
  }
  public getCommit(sha: string): Promise<git.ICommit> {
  