celery: fail with exception if bootstrap is failed

rhodecode/lib/celerylib/loader.py

@@ -138,13 +138,14 b' def on_preload_parsed(options, **kwargs)'
 
     log.debug('Bootstrapping RhodeCode application...')
 
-    env = {}
     try:
         env = bootstrap(ini_location, options=options)
     except Exception:
         log.exception('Failed to bootstrap RhodeCode APP')
+        raise
 
     log.debug('Got Pyramid ENV: %s', env)
+
     celery_settings = get_celery_config(env['registry'].settings)
 
     setup_celery_app(