Add ability to hide the no items content

[joelzwarrington]

• I have read CONTRIBUTING.md.
• I have created a discussion that was approved by a maintainer (for new features).

Adds the ability to hide the no items message. This is nice to have as when This prevents

Below, I'm showing what it looks like when setting SetShowNoItems with the list-fancy example.

SetShowNoItems(false)

SetShowNoItems(true)

1. This is the default (to keep existing behaviour unchanged), so someone doesn't need to set this when upgrading

As you can see, the no items message is duplicated in the status bar and content sections.