Make entity properties return undefined value after entity is deleted

libraries/entities/src/EntityItemProperties.cpp

@@ -47,7 +47,9 @@ _localRenderAlphaChanged(false),
 _defaultSettings(true),
 _naturalDimensions(1.0f, 1.0f, 1.0f),
 _naturalPosition(0.0f, 0.0f, 0.0f),
-_desiredProperties(desiredProperties)
+_desiredProperties(desiredProperties),
+
+_entityFound(false)
 {
 }
 
@@ -321,6 +323,11 @@ QScriptValue EntityItemProperties::copyToScriptValue(QScriptEngine* engine, bool
     QScriptValue properties = engine->newObject();
     EntityItemProperties defaultEntityProperties;
 
+    if (!_entityFound) {
+        // Return without setting any default property values so that properties are reported in JavaScript as undefined.
+        return properties;
+    }
+
     if (_idSet) {
         COPY_PROPERTY_TO_QSCRIPTVALUE_GETTER_ALWAYS(id, _id.toString());
     }

libraries/entities/src/EntityItemProperties.h

@@ -272,6 +272,8 @@ public:
     void setJointRotationsDirty() { _jointRotationsSetChanged = true; _jointRotationsChanged = true; }
     void setJointTranslationsDirty() { _jointTranslationsSetChanged = true; _jointTranslationsChanged = true; }
 
+    void setEntityFound() { _entityFound = true; }
+
 protected:
     QString getCollisionMaskAsString() const;
     void setCollisionMaskFromString(const QString& maskString);
@@ -283,6 +285,8 @@ private:
     EntityTypes::EntityType _type;
     void setType(const QString& typeName) { _type = EntityTypes::getEntityTypeFromName(typeName); }
 
+    bool _entityFound;
+
     float _glowLevel;
     float _localRenderAlpha;
     bool _glowLevelChanged;

libraries/entities/src/EntityScriptingInterface.cpp

@@ -202,11 +202,13 @@ EntityItemProperties EntityScriptingInterface::getEntityProperties(QUuid identit
                     }
                 }
 
+                results = convertLocationToScriptSemantics(results);
+                results.setEntityFound();
             }
         });
     }
 
-    return convertLocationToScriptSemantics(results);
+    return results;
 }
 
 QUuid EntityScriptingInterface::editEntity(QUuid id, const EntityItemProperties& scriptSideProperties) {