make data prop optional

When using the `Output` component this will be passed automatically.

Author: KyleGobel

packages/transform-plotly/src/index.tsx

@@ -3,7 +3,7 @@ import cloneDeep from "lodash.clonedeep";
 import React from "react";
 
 interface Props {
-  data: string | object;
+  data?: string | object;
   mediaType: "application/vnd.plotly.v1+json";
 }
 
@@ -100,6 +100,7 @@ export class PlotlyTransform extends React.Component<Props> {
   };
 
   render() {
+    if (!this.props.data) return null;
     const { layout } = this.getFigure();
     const style: React.CSSProperties = {};
     if (layout && layout.height && !layout.autosize) {