After all the groups in the branch are hidden, an error is reported when calling fromJSON()

[zhaijunlei955]

1、

2、

3、

[zhaijunlei955]

This error report will occur when the group is hidden and the length of the group's panels is 0

[zhaijunlei955]

Or the number of panels of the group is not 0. After hiding all groups of the branch (the number of groups>=2), calling fromJSON again, and then calling setVisible to show the group is invalid

[mathuo]

This should be fixed in the latest version 1.15.1.