upgrade script checks for null building addresses.
upgrade script checks for null building addresses.

Don't bother trying to make building address non-null if there are
buildings with no address. This means buildings have been
deleted from DSDB, but not from aqdb. Instead, raise a message
with the suspect aq building codes

Reviewed-by: Wesley Hertlein <ca32100e9f664971b15d1470ddc7f009d907efd3@morganstanley.com>

guillaume-philippon/aquilon,guillaume-philippon/aquilon,quattor/aquilon,guillaume-philippon/aquilon,quattor/aquilon,stdweird/aquilon,quattor/aquilon,stdweird/aquilon,stdweird/aquilon