There are scenarios where the wsrep_rec_pos variable is being returned
without it being first initialized when the .communicate() method
returns a blank. This patchset sets up a default initialization, so
the readiness check does not error out with an exception.
Change-Id: Ifea922f446bf3cbc9220f39a41dffc2763e6a5f3
Signed-off-by: Tin Lam <tin@irrational.io>