bug#22388: 24.5; [PATCH] eww fails submitting searches involving hidden fields with no value

[Vasilij Schneidermann]

See title.  The website exhibiting hidden fields with a name, but no
value attribute was http://google.com/.  I've attached a patch working
around the problem, but am not really happy with it as there's a number
of other places assuming that plist access will always yield a non-nil
value.

0001-Encode-missing-value-as-empty-string.patch
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