[js][exp] fix removed "ownProps.data" prop being used

conda/js/src/components/experiment/ExperimentEditor.jsx

@@ -1269,7 +1269,9 @@ export class ExperimentEditor extends React.Component<Props, State> {
 }
 
 const mapStateToProps = (state, ownProps) => {
-	const tcName = ownProps.data.name.split('/').slice(1, 4).join('/');
+	const exps = Selectors.experimentGet(state);
+	const data = exps[ownProps.index] || undefined;
+	const tcName = data ? data.name.split('/').slice(1, 4).join('/') : '';
 	const tc = Selectors.toolchainGet(state).find(t => t.name === tcName) || {
 		name: '',
 		contents: {
@@ -1278,13 +1280,12 @@ const mapStateToProps = (state, ownProps) => {
 			datasets: [],
 		}
 	};
-	const exps = Selectors.experimentGet(state);
 	const normalBlocks = Selectors.normalBlocks(state);
 	const analyzerBlocks = Selectors.analyzerBlocks(state);
 
 	const obj = {
 		experiments: exps,
-		data: exps[ownProps.index] || getValidObj({name: '', contents: {}}, tc, [normalBlocks, ...analyzerBlocks]),
+		data: data || getValidObj({name: '', contents: {}}, tc, [normalBlocks, ...analyzerBlocks]),
 		// algorithms for normal blocks
 		normalBlocks,
 		// algorithms for analyzer blocks