Allow parsing an empty Provides linemain

If dpkg-gencontrol was involved in the creation of a package we will not
usually encounter empty or otherwise useless fields, but apparently not
everyone is using it.

It isn't recommended to have these empty lines, but it isn't too hard to
ignore for Provides as we did for dependencies already and apt-ftparchive
can be convinced to produce empty files (if you feed it such a package)
as well, so lets be nice and provide users with a more accepting parser.

Closes: #1069874

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