[Dbix-class] Views and tables without primary keys

[IvorW]

I have an application that uses a view. The application uses
DBIx::Class::Schema::Loader, and I get a warning about primary keys,
every time I start the app. The application works fine. In fact I get
the warning when I use a MySQL database, but not when I use sqlite.

I've traced it in the source code to DBIx::Class::Schema::Loader::Base,
and I attach a patch which removes the warning. In theory, this warning
might be serving some purpose if you had a genuine table that didn't
have a primary key, but not for a view. This warning just gets in the way.
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