Fix #13310: Parse empty Java compilation units as EmptyTree #13378
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Before this commit, an empty Java compilation unit (one without a package declaration or any top level declarations) was parsed as
PackageDef(Ident(<empty>),List())
which resulted in position not set errors.With this commit, an empty Java compilation unit is parsed as
EmptyTree
. This is consistent with the parsing of empty Scala compilation units.Fixes #13310