[llvm] [symbolizer] Empty string is not an error (PR #92660)

[David Blaikie via llvm-commits]

dwblaikie wrote:

What bad thing happens if this isn't checked for, though? (presumably if the process has exited, the next thing you're going to do is try to write to its stdin, and that should fail fast, right?) And even if it can be checked for, as discussed, things can still fail (though perhaps less likely - but then again, what're the common failures we're trying to account for early on? Are they so common that they're worth this extra checking, special case, and extra functionality?) 

https://github.com/llvm/llvm-project/pull/92660