[PATCH] Minor fix to conf handling of empty values

[Amitay Isaacs]

Hi,

In tini, allow_empty_value=false causes the parser to ignore the lines
without '=' sign, but lines with nothing after '=' sign are allowed and
cause empty string ("") to be passed as a value.

This is counter-intuitive, so conf requires special handling for empty
values (which are treated as invalid).

Please review and push.

Amitay.
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