tracing: If parent span is propagated with empty string, it causes th…#6263

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mattklein123 merged 2 commits intoenvoyproxy:masterfrom

objectiser:ignoreemptyparentspan

Mar 12, 2019

Commits on Mar 12, 2019

tracing: If parent span is propagated with empty string, it causes the next child span to not be created (i.e. returns null span)
objectiser
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Fix format
objectiser
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