Set mode to markers explicitly when adding a trace / correct delete trace payload error

Author: VeraZab

src/PlotlyEditor.js

@@ -93,7 +93,7 @@ class PlotlyEditor extends Component {
         if (this.props.onAddTrace) {
           this.props.onAddTrace(payload);
         }
-        graphDiv.data.push({x: [], y: [], type: 'scatter'});
+        graphDiv.data.push({x: [], y: [], type: 'scatter', mode: 'markers'});
         if (this.props.onUpdate) {
           this.props.onUpdate();
         }
@@ -104,7 +104,7 @@ class PlotlyEditor extends Component {
           this.props.onDeleteTrace(payload);
         }
         if (payload.traceIndexes && payload.traceIndexes.length) {
-          graphDiv.data.splice(payload[0], 1);
+          graphDiv.data.splice(payload.traceIndexes[0], 1);
           if (this.props.onUpdate) {
             this.props.onUpdate();
           }