Update framework forwarding logic to handle nil system views (#8114)

sdk/framework/backend_test.go

@@ -124,6 +124,7 @@ func TestBackendHandleRequest_Forwarding(t *testing.T) {
 		isStandby    bool
 		isSecondary  bool
 		expectFwd    bool
+		nilSysView   bool
 	}{
 		"no forward": {
 			expectFwd: false,
@@ -159,6 +160,10 @@ func TestBackendHandleRequest_Forwarding(t *testing.T) {
 			isSecondary: true,
 			expectFwd:   false,
 		},
+		"nil system view": {
+			nilSysView: true,
+			expectFwd:  false,
+		},
 	}
 
 	for name, test := range tests {
@@ -193,6 +198,10 @@ func TestBackendHandleRequest_Forwarding(t *testing.T) {
 				},
 			}
 
+			if test.nilSysView {
+				b.system = nil
+			}
+
 			_, err := b.HandleRequest(context.Background(), &logical.Request{
 				Operation: logical.ReadOperation,
 				Path:      "foo",