Enhance child registration logging and add validation for measurement child

src/specificClass.js

@@ -75,13 +75,13 @@ class Machine {
 
   /*-------------------               Register child events               -------------------*/
   registerChild(child, softwareType) {
-    this.logger.debug('Setting up child event for softwaretype ' + softwareType);
-
     switch (softwareType) {
       case "measurement":
+        this.logger.debug(`Registering measurement child...`);
         this._connectMeasurement(child);
         break;
       case "reactor":
+        this.logger.debug(`Registering reactor child...`);
         this._connectReactor(child);
         break;
       
@@ -91,10 +91,14 @@ class Machine {
   }
 
   _connectMeasurement(measurementChild) {
+    if (!measurementChild) {
+      this.logger.warn("Invalid measurement provided.");
+      return;
+    }
+
     const position = measurementChild.config.functionality.positionVsParent;
     const distance = measurementChild.config.functionality.distanceVsParent || 0;
     const measurementType = measurementChild.config.asset.type;
-    const key = `${measurementType}_${position}`;
     //rebuild to measurementype.variant no position and then switch based on values not strings or names.
     const eventName = `${measurementType}.measured.${position}`;