Fix a few small issues.#33

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willemdj wants to merge 8 commits intobet365:masterfrom

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Commits on Nov 21, 2016

Fix problems introduced by fix for issue #13.
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Commits on Nov 8, 2017

Fix some small issues.
willemdj
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Commits on May 17, 2018

Merge branch 'define-null-feature/extra-callbacks-for-middleware-1'
willemdj
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