[symbolizer] Empty string is not an error (#97781) This is recommit of llvm/llvm-project#92660, reverted in llvm/llvm-project#94424. Original commit message is below. After commit https://github.com/llvm/llvm-project/commit/1792852f86dc75efa1f44d46b1a0daf386d64afa ([symbolizer] Change reaction on invalid input) llvm-symbolizer issues an error on malformed command instead of echoing it to the standard output, as in previous versions. It turns out this behavior broke a use case when echoing was used to check if llvm-symbolizer is working (https://github.com/llvm/llvm-project/commit/1792852f86dc75efa1f44d46b1a0daf386d64afa#commitcomment-142161925). With this change an empty line as input is not considered as an error anymore and does not produce any output on stderr. llvm-symbolizer still respond on empty line with line not found, this is consistent with GNU addr2line.
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