[PATCH] D47701: [clangd] Hover should return null when not hovering over anything.

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
sammccall added a reviewer: ioeric.
Herald added subscribers: cfe-commits, jkorous, MaskRay, ilya-biryukov, klimek.

Also made JSON serialize Optional<T> to simplify this.


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D47701

Files:
  clangd/ClangdLSPServer.cpp
  clangd/ClangdServer.cpp
  clangd/ClangdServer.h
  clangd/JSONExpr.h
  clangd/XRefs.cpp
  clangd/XRefs.h
  test/clangd/hover.test
  unittests/clangd/JSONExprTests.cpp
  unittests/clangd/XRefsTests.cpp

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