fix: improve try/catch for mirrorMode config

lib/workers/repository/init/config.js

@@ -18,9 +18,13 @@ async function mergeRenovateConfig(config) {
       );
       logger.info('Found mirror config');
     } catch (err) {
+      // Do nothing
+    }
+    if (!renovateJson) {
       logger.debug('No mirror config found - using default config');
       renovateJson = { extends: ['config:base'] };
     }
+    logger.debug({ renovateJson }, 'mirrorMode config');
     const migratedConfig = migrateAndValidate(config, renovateJson);
     const resolvedConfig = await presets.resolveConfigPresets(migratedConfig);
     returnConfig = mergeChildConfig(returnConfig, resolvedConfig);