Fix panic in otlp traces to zipkin #1963
Merged
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Description:
Fixing a bug. There was a panic converting internal traces to zipkin, which occured if there were both a valid span and a nil span. With only nil span the error was about absence of trace id. No check for nil span was present - that is the bug.
Link to tracking Issue: might be connected to #1845
Testing: added test with 2 spans