Interp: Ignore NoSymbol definitions

A NoSymbol syminterp leads to a Any+AnyOfOrAll(None) definition, which
is never what anyone would actually ever want in a sym interp.  The
failure mode here was:
    interpret XF86SomeKeysymYouDontHaveYet {
        action=Something()
    }
leading to:
    interpret Any+AnyOfOrAll(None) {
        action=Something()
    }
leading to every single non-action key triggering your shiny new action
that was only supposed to come from a new keysym.

At least you could VT switch or zap, I guess.

Later, more invasive, revisions will bring a more useful error message.

Signed-off-by: Daniel Stone <daniel@fooishbar.org>

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