[clang-tools-extra] [clangd] Fix SIGSEGV crash when receiving a textDocument/didOpen request with the URI pointing to a directory (PR #177834)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

> Alright, I'll create a new test file for this?

Yep, I think that would make sense.

> Also, Should I add unittests as well?

No need for unit tests for this change.

https://github.com/llvm/llvm-project/pull/177834