[Issue 15874] getSymbolsByUDA fails if struct has no UDAs

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15874

--- Comment #1 from Uldis Kalniņš <uldis.kalninsh at gmail.com> ---
Created pull request:
https://github.com/D-Programming-Language/phobos/pull/4164

This is first time I'm contributing to github and D, if I'm doing something
wrong, please tell me :)

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