[FIX] fix bug in s3 event handler
[FIX] fix bug in s3 event handler

subhankarb/dpr-api,frictionlessdata/dpr-api,anuveyatsu/dpr-api,anuveyatsu/dpr-api,frictionlessdata/dpr-api,anuveyatsu/dpr-api,frictionlessdata/dpr-api