Bug Fix #97 - Removed Organisation Address References

Remove Device Profile references to an address when its removed, and
anticipate missing addresses where referenced.

Disco.Services/Jobs/JobLists/JobTableExtensions.cs

@@ -270,7 +270,7 @@ namespace Disco.Services
                 j.OpenedTechUserFriendlyId = ActiveDirectory.FriendlyAccountId(j.OpenedTechUserId);
 
                 if (j.DeviceAddressId.HasValue)
-                    j.DeviceAddress = Database.DiscoConfiguration.OrganisationAddresses.GetAddress(j.DeviceAddressId.Value).Name;
+                    j.DeviceAddress = Database.DiscoConfiguration.OrganisationAddresses.GetAddress(j.DeviceAddressId.Value)?.Name;
             }
 
             return items;

Disco.Services/Jobs/Noticeboards/HeldDeviceItem.cs

@@ -53,9 +53,7 @@ namespace Disco.Services.Jobs.Noticeboards
                 if (DeviceAddressId.HasValue)
                 {
                     var config = new OrganisationAddressesConfiguration(null);
-                    var address = config.GetAddress(DeviceAddressId.Value);
-                    if (address != null)
-                        return address.ShortName;
+                    return config.GetAddress(DeviceAddressId.Value)?.ShortName;
                 }
 
                 return null;