Yes, we know not to remove devices before removing them from all rules that use them, but sometimes we forget, or miss one.
For Actions, the "Broken" is easy enough to fix, but for Triggers, you're left with an unsightly blank space, with no recourse other than to delete the entire rule and start over.
I request the addition of one of these two options.
An addition to the "Delete Event Trigger" dropdown menu that would delete all of a rule's triggers.
or
Instead of the current blank space, replace a broken trigger with a "Broken Trigger" message (like the "Broken" message for an action) that could then be selected from the "Delete Event Trigger" dropdown and deleted.
My OCD gets the better of me in these situations too. As Bruce has said in the past that it doesn't affect the rule like the broken parts do, so you shouldn't have to redo the rule. It's just not what you or I want it to look like. I would second this request, even if it is on the back burner for a while.
In this case the rule still works. However it is impossible to remove the missing/broken conditions because they do not appear in the 'edit' or 'delete' conditions options.