CA-250234 - XenCenter hit with NullReferenceException at HAPage.Rebuild()
CA-250234 - XenCenter hit with NullReferenceException at HAPage.Rebuild()

Signed-off-by: Letsibogo Ramadi <bc00b6cf787900848f0c82bb6941531129c6189f@citrix.com>

minli1/xenadmin,xenserver/xenadmin,jijiang/xenadmin,jijiang/xenadmin,huizh/xenadmin,stephen-turner/xenadmin,stephen-turner/xenadmin,kc284/xenadmin,kc284/xenadmin,stephen-turner/xenadmin,huizh/xenadmin,MihaelaStoica/xenadmin,minli1/xenadmin,MihaelaStoica/xenadmin,MihaelaStoica/xenadmin,stephen-turner/xenadmin,letsboogey/xenadmin,kc284/xenadmin,huizh/xenadmin,stephen-turner/xenadmin,huizh/xenadmin,jijiang/xenadmin,MihaelaStoica/xenadmin,letsboogey/xenadmin,letsboogey/xenadmin,MihaelaStoica/xenadmin,minli1/xenadmin,xenserver/xenadmin,minli1/xenadmin,huizh/xenadmin,letsboogey/xenadmin,MihaelaStoica/xenadmin,letsboogey/xenadmin,minli1/xenadmin,jijiang/xenadmin,xenserver/xenadmin,minli1/xenadmin,stephen-turner/xenadmin,jijiang/xenadmin,huizh/xenadmin,kc284/xenadmin,kc284/xenadmin,jijiang/xenadmin,letsboogey/xenadmin