Bookmark tries to preserves state of broken layers

[AleksueiR]

If a layer fails to load, as the Ozone layer frequently does, the bookmark will still try to preserve its state. This bookmark will fail on subsequent load since trying to apply a broken layer state to the config.

[AleksueiR]

There is a bizarre edge case with the Ozone layer when it's broken:

• the root dynamic layer loads, but it has no children:
• a dynamic child is specified in the config withe the singleEntryCollapse option specified
• the layer record loads correctly and its state is changed to rv-loaded
• the dynamic legend group is suppressed due to the singleEntryCollapse option
• the dynamic child tree fails to load since the service is broken
• no child legend nodes are created and added to the group
• the layers list is empty now - dynamic group is suppressed, and no children is visible

[AleksueiR]

Bookmark now only preserves state of loaded layers.