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* GH-3454: From MQTT conversion error - to error ch Fixes https://github.com/spring-projects/spring-integration/issues/3454 The message converter may return null when we try to covert from the MQTT message. The thrown exception may also reset the client connect. * Fix `MqttPahoMessageDrivenChannelAdapter` to catch any conversion errors (including `null` result) and try to send an `ErrorMessage` with that info into the provided `errorChannel`. Otherwise re-throw it as as **Cherry-pick to `5.4.x` & `5.3.x`** * * Apply review language-specific changes