When a user creates a conditional breakpoint and the provided condition cannot be evaluated, the breakpoint should display an error annotation.

This annotation can only exist at runtime since the condition is only evaluated at runtime.

This way, normal users can hide the Debugger Console and still get error messages like this:

  "entry" is not a known variable in the current context.

The idea is to move user-oriented messages to annotations and shift the target audience of the Debugger Console to Netbeans developers. Normal users shouldn't need it open.