String getStringProperty(String name, String defaultValue) {
        String prop = getStringProperty(name);
        return (prop == null) ? defaultValue : prop;
    }
See https://jira.qos.ch/browse/SLF4J-499
@since 1.7.33 and 2.0.0-alpha6
slf4j-simple/src/main/java/org/slf4j/simple/SimpleLoggerConfiguration.java