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https://issues.apache.org/jira/browse/WICKET-3884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067789#comment-13067789
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Martin Grigorov commented on WICKET-3884:
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I think special values VA_ADD and VA_REMOVE should be deprecated.
If AttributeModifier should be able to remove an attribute then explicit
#remove(String) method should be added.
> Null model for AttributeAppender should not render empty attribute
> ------------------------------------------------------------------
>
> Key: WICKET-3884
> URL: https://issues.apache.org/jira/browse/WICKET-3884
> Project: Wicket
> Issue Type: Bug
> Components: wicket-core
> Affects Versions: 1.5-RC5.1
> Reporter: Robert McGuinness
> Assignee: Martijn Dashorst
> Priority: Trivial
> Labels: attributes
> Attachments: attr-modifier-by-identity.patch, test-WICKET-3884.patch
>
>
> I can't think of a reason this would be valid, but passing in null model
> renders <span class="">Test</span>. If previous and new attribute are both
> null, the component should render cleanly like <span>Test</span>.
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