[management] handle nil ptr in sendInitialSync() when the peer is deleted (#7315)

* fix a nil-ptr error occuring in sendInitialSync when the peer being synced is deleted

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* handle a nil ptr in GetPeerNetworkMapComponents

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

---------

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

management/server/account/request_buffer.go

@@ -6,6 +6,8 @@ import (
 	"github.com/netbirdio/netbird/management/server/types"
 )
 
+//go:generate go tool mockgen -package=account -source=./request_buffer.go -destination=request_buffer_mock.go
+
 type RequestBuffer interface {
 	GetAccountWithBackpressure(ctx context.Context, accountID string) (*types.Account, error)
 }