All message view has `in-home` filter and is not empty.
If there are no terms provided, we set filter to display
all messages (including muted streams/topics).
We make it mandatory to provide terms to Filter.
This lets us simplify the long-ish ‘../../static/js’ paths, and will
remove the need for the ‘zrequire’ wrapper.
Signed-off-by: Anders Kaseorg <anders@zulip.com>