Hello,
while printing different kinds of packages, I found the following strange behaviour of packages:
@startuml
package "Folder1" as node1 <<Folder>> {
}
package "Folder2" as node2 <<Folder>> {
class content
}
@enduml
http://plantuml.com/plantuml/png/AqXCpavCJrLGSilFIKajCbHII2nMoCjFIJLKiB61YDdPALHprN8LeAeqWgiqGbMfe92SarXSh92SdrUIcbV2LGi0
The problem of the empty package with the Folder style is, that it shows its label (from my point of view: this is internal information and should be hidden) and its name together.
My suggestion for improving the visualization of an empty package: Remove "Folder1" and replace "node1" by "Folder1".