Meta tag is not rendered when token returns empty value

Consider the following settings:

1. Global metadata is set, `description` tag value is `Lorem ipsum dolor sit amet`.
2. Content metadata (under Global) is set, `description` tag value is `[node:summary]`.

Cases:

1. If we navigate to the Homepage, which is not a Node, then the Global description tag is rendered.
2. If we navigate to "About us", which is a Node and have the Body field filled, then the Content description tag is rendered.
3. If we navigate to "Services", which is a Node but don't have Body field filled, then no `description` tag will be rendered.

IMO the 3rd case would outputs the Global description tag instead of nothing. I think metatag should always inherit the parent settings if its own tag is empty or doesn't set.

Does it make sense?