Empty/nonexistent entries in the History window can still be right clicked, causing a context menu to appear

Steps to reproduce the issue:

1. Create a new Orion profile
2. Go to History -> Show History or press ⌘+Y
3. Right click anywhere on the empty history window
4. The context menu appears as if you had just clicked on a history entry despite there not being one

Expected behavior:
If there is nothing to click on, right clicking shouldn't cause a context menu to appear at all.

Version 0.99.129.1-rc (WebKit 621.1.2.111.4)

Sequoia (15)