Panic when filtering for (tag | tag_value)

The following program causes a panic against the latest release version and the `master` branch:

```rust
use legion::prelude::*;

fn main() {
let mut world = Universe::new().create_world();

#[derive(Clone, PartialEq)] struct Tag1;
#[derive(Clone, PartialEq)] struct Tag2(u32);
#[derive(Clone, PartialEq)] struct Component;

let entity = world.insert((), std::iter::once((Component,)))[0];

world.add_tag(entity, Tag1).unwrap();
world.add_tag(entity, Tag2(123)).unwrap();

let query = Read::::query()
.filter(tag::() | tag_value(&Tag2(123)));

for _ in query.iter(&world) {}
}
```

```
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', /Users/tuzz/.cargo/git/checkouts/legion-6fbc02e8da0bdce7/d51f71f/legion_core/src/filter.rs:1072:13
```

I'm trying to filter by the presence of a tag unioned with a tag_value. My understanding is that this should be supported? Thanks