Fix: handle capture page faults as skip field

Fix: handle capture page faults as skip field

Now that we have the appropriate save/restore position mechanism for
error handling in place, we can handle page faults on copy-from-user by
skipping the offending captured field entirely rather than relying on an
empty string.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ibe1e818f57f8218d2b83281a572895884fc28b86