[tests-only] Fix panic in storageSpaceFromNode (cs3org#2504)

* fix panic in storageSpaceFromNode

Signed-off-by: jkoberg <[email protected]>

* check node for being nil

Signed-off-by: jkoberg <[email protected]>

* Revert "check node for being nil"

This reverts commit e38228e.

Author: kobergj

Diff for: pkg/storage/utils/decomposedfs/spaces.go

@@ -544,7 +544,7 @@ func (fs *Decomposedfs) storageSpaceFromNode(ctx context.Context, n *node.Node,
 			return p.Stat
 		})
 		if err != nil || !ok {
-			return nil, errtypes.PermissionDenied(fmt.Sprintf("user %s is not allowed to Stat the space %s", user.Username, n.SpaceRoot.ID))
+			return nil, errtypes.PermissionDenied(fmt.Sprintf("user %s is not allowed to Stat the space %s", user.Username, n.ID))
 		}
 
 		if strings.Contains(n.Name, node.TrashIDDelimiter) {
@@ -553,7 +553,7 @@ func (fs *Decomposedfs) storageSpaceFromNode(ctx context.Context, n *node.Node,
 				return p.AddGrant
 			})
 			if err != nil || !ok {
-				return nil, errtypes.PermissionDenied(fmt.Sprintf("user %s is not allowed to list deleted spaces %s", user.Username, n.SpaceRoot.ID))
+				return nil, errtypes.PermissionDenied(fmt.Sprintf("user %s is not allowed to list deleted spaces %s", user.Username, n.ID))
 			}
 		}
 	}