fix playbook loader

lib/load-check-links-playbook.js

@@ -87,19 +87,31 @@ function rewriteCurrentVersion() {
 	}
 }
 
-function excludeBaseBranch(sources, repoName, branchName) {
-	const matchedRepos = sources.filter(source => source.url.endsWith(repoName));
-	if (matchedRepos.length === 0) {
-		throw new Error(`There is no repository ${repoName} among the playbook sources!`);
-	}
-	let currentSource = matchedRepos.find(source => isMatch(branchName, source.branches));
+function getCurrentSource(matchedRepos, branchName) {
+	let currentSource = matchedRepos.find(source => {
+		if (Array.isArray(source.branches)) {
+			return source.branches.find(branch => isMatch(branchName, branch));
+		} else {
+			return isMatch(branchName, source.branches);
+		}
+	});
 	if (!currentSource) {
 		console.debug(`No matching base branch found. Rewriting version to omit version collision!`);
 		rewriteCurrentVersion();
 		currentSource = matchedRepos[0];
 	}
+
+	return currentSource;
+}
+
+function excludeBaseBranch(sources, repoName, branchName) {
 	const excludedBranch = `!${branchName}`;
+	const matchedRepos = sources.filter(source => source.url.endsWith(repoName));
+	if (matchedRepos.length === 0) {
+		throw new Error(`There is no repository ${repoName} among the playbook sources!`);
+	}
 
+	const currentSource = getCurrentSource(matchedRepos, branchName);
 	if (Array.isArray(currentSource.branches)) {
 		currentSource.branches.push(excludedBranch);
 	} else {