Always publish first on_change event

Author: tyeth

src/components/analogIO/Wippersnapper_AnalogIO.cpp

@@ -422,7 +422,7 @@ void Wippersnapper_AnalogIO::update() {
             _analog_input_pins[i].prvPinVal -
             (_analog_input_pins[i].prvPinVal * CURRENT_HYSTERISIS);
 
-        if (pinValRaw > _pinValThreshHi || pinValRaw < _pinValThreshLow) {
+        if (_analog_input_pins[i].prvPeriod == 0 || pinValRaw > _pinValThreshHi || pinValRaw < _pinValThreshLow) {
           // Perform voltage conversion if we need to
           if (_analog_input_pins[i].readMode ==
               wippersnapper_pin_v1_ConfigurePinRequest_AnalogReadMode_ANALOG_READ_MODE_PIN_VOLTAGE) {