Do pre-existing monitor blocks ever exist during deserialization?

[adroitwhiz]

In #1686, deserializeMonitor was added, which checks for existing monitor blocks. That code still exists.

However, #1818 removes all monitor blocks when a project is unloaded. As such, will the "pre-existing monitor block" case ever still be hit?

[adroitwhiz]

/cc @kchadha @picklesrus