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https://issues.apache.org/jira/browse/NIFI-1785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15248473#comment-15248473
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ASF GitHub Bot commented on NIFI-1785:
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Github user markap14 commented on the pull request:
https://github.com/apache/nifi/pull/365#issuecomment-212085785
+1 this looks good to me.
> Add Validator to check for empty strings
> ----------------------------------------
>
> Key: NIFI-1785
> URL: https://issues.apache.org/jira/browse/NIFI-1785
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Oleg Zhurakousky
> Assignee: Oleg Zhurakousky
> Priority: Minor
> Fix For: 1.0.0, 0.7.0
>
>
> There are use cases where property must contain a string value which contains
> 1+ non-whitespace character, however at the moment we only have
> NON_EMPTY_VALIDATOR which simply validates that string length > 0.
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