[whatwg/encoding] Editorial: check non-null before null (#107)

In particular in all places with two null checks in a row and for
EUC-JP as it would stand out otherwise.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/encoding/pull/107

-- Commit Summary --

  * EUC-JP: only unwind ASCII bytes
  * Editorial: check non-null before null

-- File Changes --

    M encoding.bs (56)

-- Patch Links --

https://github.com/whatwg/encoding/pull/107.patch
https://github.com/whatwg/encoding/pull/107.diff

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