Better reporting of error when attempt to save item to adapter with a null key value.

Errors:
Timestamp	Severity	Source	Module	Message
3/02/2011 1:30:02 PM	Error	Logging	Logging	"Unable to raise start notification:

System.NullReferenceException: Object reference not set to an instance of an object.
at Unify.Framework.MultiKeyValue.<ToString>b__0(IValue value)
at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
at System.Linq.Enumerable.ToArrayTSource(IEnumerable`1 source)
at Unify.Framework.MultiKeyValue.ToString()
at System.Text.StringBuilder.AppendFormat(IFormatProvider provider, String format, Object[] args)
at System.String.Format(IFormatProvider provider, String format, Object[] args)
at System.String.Format(String format, Object arg0, Object arg1, Object arg2)
at Unify.Notification.ConnectorModifyAnchorEntityNotificationFactory.GetConnectorServiceProcessDetail()
at Unify.Notification.ConnectorNotificationFactory.GetServiceProcessDetail()
at Unify.Notification.TaskNotifier`1..ctor(INotificationMessageService messageService, T factory)"

Timestamp	Severity	Source	Module	Message
3/02/2011 1:30:02 PM	Warning	Adapter request to save entity to adapter space failed.	Adapter	"Adapter request to save entity 531f8d06-81b1-488f-b5e8-6dc932a0093d
to adapter space 278900c3-9b42-4c36-9400-6f1e5eb3354a failed with reason Object reference not set to an instance of an object.. 
Duration: 00:00:00.1718750
Error details:
System.NullReferenceException: Object reference not set to an instance of an object.
at Unify.Notification.TaskNotifier`1.Dispose()
at Unify.Framework.EventNotifierModifyAnchorConnectorDecorator.ModifyAnchor(MultiKeyValue oldKey, MultiKeyValue newKey)
at Unify.Framework.Adapter.<>c_DisplayClass34.<CheckAnchorChangeOnSave>b_2f(KeyValuePair`2 keyValue)
at Unify.Framework.Visitor.<>c_DisplayClass1`1.<Visit>b_0(T item, Int32 index)
at Unify.Framework.Visitor.VisitT(IEnumerable`1 visitCollection, Action`2 visitor)
at Unify.Framework.Visitor.VisitT(IEnumerable`1 visitCollection, Action`1 visitor)
at Unify.Framework.Adapter.CheckAnchorChangeOnSave(IEntitySchema connectorSchema, IEnumerable`1 entitiesToSave, IEntityPartitionUpdatableContext connectorContext, IEnumerable`1 entityIds)
at Unify.Framework.Adapter.SaveEntities(IEnumerable`1 entities, Boolean reflect)
at Unify.Framework.Adapter.SaveEntity(IAdapterEntity entity, Boolean reflect)
at Unify.Framework.Adapter.SaveEntity(IAdapterEntity entity)
at Unify.Framework.AdapterNotifierDecorator.SaveEntity(IAdapterEntity entityToSave)
at Unify.Framework.LDIFAdapter.ExportAdapterEntity(IAdapterEntity adapterEntity, Guid adapterId)
at Unify.Framework.LDIFAdapterServiceHostDecorator.ExportAdapterEntity(IAdapterEntity adapterEntity, Guid adapterId)
at SyncInvokeExportAdapterEntity(Object , Object[] , Object[] )
at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)"