Review Request: FLUME-1338: Produce helpful error message in case that timestamp header is missing when time based bucketing is in use

[Jarek Cecho]

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https://reviews.apache.org/r/5746/
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Review request for Flume.


Description
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I've added catch block that will repack NumberFormatException into 
RuntimeException with helpful error message.


This addresses bug FLUME-1338.
    https://issues.apache.org/jira/browse/FLUME-1338


Diffs
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/trunk/flume-ng-core/src/main/java/org/apache/flume/formatter/output/BucketPath.java
 1357243 

Diff: https://reviews.apache.org/r/5746/diff/


Testing
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mvn test


Thanks,

Jarek Cecho