Fix TextAreaSocketPreviewView after Optional Refactor

Author: JLLeitschuh

ui/src/main/java/edu/wpi/grip/ui/preview/TextAreaSocketPreviewView.java

@@ -24,7 +24,7 @@ public TextAreaSocketPreviewView(EventBus eventBus, OutputSocket<T> socket) {
 
         this.setStyle("-fx-pref-width: 20em;");
 
-        this.text = new TextArea(socket.getValue().toString());
+        this.text = new TextArea(socket.getValue().orElse((T)"").toString());
         text.setEditable(false);
 
         this.setContent(text);
@@ -35,7 +35,7 @@ public void onSocketChanged(SocketChangedEvent event) {
         final Socket socket = event.getSocket();
 
         if (socket == this.getSocket()) {
-            this.text.setText(socket.getValue().toString());
+            this.text.setText(socket.getValue().orElse("").toString());
         }
     }
 }