only use config.STATICSDIR_PREFIX when its set
only use config.STATICSDIR_PREFIX when its set

blocktrail/blocktrail-webwallet,blocktrail/blocktrail-webwallet,blocktrail/blocktrail-webwallet,blocktrail/blocktrail-webwallet,blocktrail/blocktrail-webwallet,blocktrail/blocktrail-webwallet