`PopulatedEventReader` system parameter
Open
A-ECS
C-Feature
D-Modest
S-Ready-For-Implementation
X-Contentious
- Dominant language
- Rust
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Description
## What problem does this solve or what need does it fill?
> I'd be interested in adding a `NonEmptyEventReader` as well, either in the same PR or in a separate one.
*@alice-i-cecile from https://github.com/bevyengine/bevy/issues/15302#issuecomment-2360998076*
(name changed for consistency with "non empty query" `Populated`)
## What solution would you like?
Add `PopulatedEventReader` that implements `SystemParam::validate_param`,
so that it returns false if there are no events.
## Similar:
- #15302
- #15264
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