Adding branch reader and tests

dist/index.js

@@ -3532,7 +3532,7 @@ class GithubCliReader {
                 return yield system_1.default.run(`gh auth status -t`);
             }
             catch (_a) {
-                return false;
+                return '';
             }
         });
     }

src/model/input-readers/github-cli.ts

@@ -7,7 +7,7 @@ export class GithubCliReader {
       assert(await System.run(`gh -v`));
       return await System.run(`gh auth status -t`);
     } catch {
-      return false;
+      return '';
     }
   }
 }