|  | @@ -55,7 +55,8 @@ bool TraceFlagList::Set(const char* name, bool enabled) {
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				|  |  |          found = true;
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				|  |  |        }
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				|  |  |      }
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				|  |  | -    if (!found) {
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				|  |  | +    // check for unknowns, but ignore "", to allow to GRPC_TRACE=
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				|  |  | +    if (!found && 0 != strcmp(name, "")) {
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				|  |  |        gpr_log(GPR_ERROR, "Unknown trace var: '%s'", name);
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				|  |  |        return false; /* early return */
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				|  |  |      }
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