eth: fix tracer panic when running without configs + reexec#15799
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The fancy tracer PR added a new functionality to reexecute a number of historical blocks for a trace if the state is missing for the requested entity (block, chain, tx). This is 128 by default but can be explicitly set via a tracer config field.
Currently there's a
nilpointer panic in the old raw tracer because that one does not have aconfigparameter at all, but the tracing code still pokes aroundconfig.Reexec. This PR fixes it by checking first whether the config parameter itself was set before trying to poke around its fields.