<p>When attempting to comment on a changeset discussion while blocked, a user receives no message but simply gets a grayed out "Comment" button after clicking.</p>

<p><a href="https://cloud.githubusercontent.com/assets/1190866/6888726/8f640762-d63b-11e4-995d-1e10974ff245.png" target="_blank"><img src="https://cloud.githubusercontent.com/assets/1190866/6888726/8f640762-d63b-11e4-995d-1e10974ff245.png" alt="image" style="max-width:100%;"></a></p>

<p>Something that makes it clear that they cannot comment would be preferable, e.g. a red button that indicates they cannot comment.</p>

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