fix: using GitHub API causes an HTTP error

index.ts

@@ -37,7 +37,7 @@ const Branches = await ListBranches(ProgramOptions).then(Branches => Branches)
 const PurgeRequest = new PurgeRequestManager(ProgramOptions)
 for (const Branch of Branches) {
 	// eslint-disable-next-line no-await-in-loop
-	const CommitSHA = await GetCommitSHAFromLatestWorkflowTime(ProgramOptions, LatestWorkflowRunTime, Branch).then(CommitSHA => CommitSHA)
+	const CommitSHA = await GetCommitSHAFromLatestWorkflowTime(ProgramOptions, LatestWorkflowRunTime, Branch, Branches[1]).then(CommitSHA => CommitSHA)
 	var ChangedFiles: string[] = []
 	if (CommitSHA.length === 0) {
 		continue

sources/branches.ts

@@ -44,5 +44,5 @@ export async function ListBranches(ProgramOptions: Types.ProgramOptionsType): Pr
 		Actions.debug(`ListBranches in branches.ts called: ${JSON.stringify(Branches)}`)
 	}
 
-	return Branches
+	return Branches.filter(Branch => Branch !== undefined && Branch !== null)
 }

sources/commits.ts

@@ -22,14 +22,14 @@ function CreateGitInstance(BasePath: string): Git.SimpleGit {
  * @param {string} Branch The branch or tag name.
  * @returns {Promise<Types.CommitSHA>} SHA of the latest commit.
  */
-export async function GetCommitSHAFromLatestWorkflowTime(ProgramOptions: Types.ProgramOptionsType, LatestWorkflowRunTime: number, Branch: string): Promise<Types.CommitSHA> {
+export async function GetCommitSHAFromLatestWorkflowTime(ProgramOptions: Types.ProgramOptionsType, LatestWorkflowRunTime: number, Branch: string, DefaultBranch: string): Promise<Types.CommitSHA> {
 	var MatchedCommitTimeAddress = 0
 	if (ProgramOptions.shouldUseApi) {
 		const GitHubInstance = CreateGitHubInstance(ProgramOptions)
 		const GitHubListCommits = await GitHubInstance.repos.listCommits({
 			owner: ProgramOptions.repo.split('/')[0],
 			repo: ProgramOptions.repo.split('/')[1],
-			sha: Branch,
+			sha: Branch === 'latest' ? DefaultBranch : Branch,
 		}).then(Response => Response.data)
 		for (const CommitRaw of GitHubListCommits) {
 			if (DateTime.fromISO(CommitRaw.commit.author.date).toMillis() < LatestWorkflowRunTime) {
@@ -91,7 +91,7 @@ export async function GetChangedFilesFromSHAToHead(ProgramOptions: Types.Program
 		const GitHubComparingRaw = await GitHubInstance.repos.compareCommits({
 			owner: ProgramOptions.repo.split('/')[0],
 			repo: ProgramOptions.repo.split('/')[1],
-			head: Branch,
+			head: Branch === 'latest' ? DefaultBranch : Branch,
 			base: CommitSHA,
 		}).then(Response => Response.data)
 		return GitHubComparingRaw.files.map(File => File.filename)