fix: don’t clean branches if repository is not found or blocked

lib/workers/repository/error.js

@@ -18,10 +18,12 @@ async function handleError(config, err) {
     delete config.branchList; // eslint-disable-line no-param-reassign
     return err.message;
   } else if (err.message === 'blocked') {
+    delete config.branchList; // eslint-disable-line no-param-reassign
     logger.info('Repository is blocked - skipping');
     return err.message;
   } else if (err.message === 'not-found') {
-    logger.info('Repository is not found');
+    delete config.branchList; // eslint-disable-line no-param-reassign
+    logger.warn('Repository is not found');
     return err.message;
   } else if (err.message === 'fork') {
     logger.info('Repository is a fork and not manually configured - skipping');