[429682] Remove Options.isSome() predicate

It was a simple wrapper around Option.some() and exposed a
Guava-specific type for no good reason. Also, it was not used anywhere
in Sirius itself.

Bug: 429682
Change-Id: I8c4cc2d22552cbb8bab5661f5a5bedbcbddf1eeb
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>
3 files changed