I20210620-1800
optional dependency warnings Change-Id: I380290121a260cda8bea63cab9279b90d4e7c21f Signed-off-by: Vikas Chandra <Vikas.Chandra@in.ibm.com> Reviewed-on: https://git.eclipse.org/r/c/pde/eclipse.pde.ui/+/182264 Tested-by: PDE Bot <pde-bot@eclipse.org>