message: Better default for MAPBOX_API_KEY
diff: @@ -246,7 +246,7 @@ INTERVAL = 1
  BACKUP_COUNT = 30
  # Set this API key to enable Mapbox visualizations
  -MAPBOX_API_KEY = ''
  +MAPBOX_API_KEY = os.environ.get('MAPBOX_API_KEY', '')
  # Maximum number of rows returned in the SQL editor
  SQL_MAX_ROW = 1000000
  