Filter out VoiceCommands that have a duplicate string

lib/js/src/manager/screen/utils/_VoiceCommandUpdateOperation.js

@@ -144,13 +144,25 @@ class _VoiceCommandUpdateOperation extends _Task {
             return true; // nothing to delete
         }
 
-        // make an AddCommand request for every voice command
-        const addCommands = this._pendingVoiceCommands.map(voiceCommand => {
+        // filter the voice command list of any voice commands with duplicate items
+        const addCommands = this._pendingVoiceCommands.filter(voiceCommand => {
+            // Sets can only hold unique values. The size will be different if there are duplicates
+            const uniqueList = new Set(voiceCommand.getVoiceCommands());
+            if (voiceCommand.getVoiceCommands().length !== uniqueList.size) {
+                return false;
+            }
+            return true;
+        }).map(voiceCommand => {
+            // make an AddCommand request for every voice command
             return new AddCommand()
                 .setCmdID(voiceCommand._getCommandId())
                 .setVrCommands(voiceCommand.getVoiceCommands());
         });
 
+        if (addCommands.length !== this._pendingVoiceCommands.length) {
+            console.log('One or more VoiceCommands contained duplicate items and will not be sent.');
+        }
+
         const addCommandPromises = addCommands.map(addCommand => {
             return this._lifecycleManager.sendRpcResolve(addCommand);
         });