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Fix notice; minor code clean-up.
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Fix menu to avoid underscores.
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Node Style -> Node Styles in keeping with other menu items.
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Improve help.
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isset is not sufficient. Fix variable sets in multi-hook loop.
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Fix delete scheme form. Fix 404 edge cases.
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Remove unnecessary abstraction.
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Formatting.
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Use drupal_not_found rather than display an error message.
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Formatting issues.