Summary: Just a small fix to ensure all plugins are shown in the list even if no device / app is connected to Flipper. We show them under "Unavailable plugins" with explanation why they not available. This allows user to check plugin documentation even without connecting anything to Flipper.
Reviewed By: passy
Differential Revision: D31532732
fbshipit-source-id: 4e481b3d6923bb073a1478b2bd283db25a374c72