Add error handling for ^ and other empty mailbox shortcuts.

Add error handling for ^ and other empty mailbox shortcuts.

(closes #2402) (closes #3735)

Explicitly mention the ^ example in the documentation added in 6d733cab6b45.

Add an error message for ^ when CurrentFolder is not set.  Add checks
for other mailbox shortcuts that expand to the empty string.  This
could happen if the @alias shortcut was accidentally used, or the value
referenced by a shortcut isn't set yet.