fix canceled column name edit

Author: alexcjohnson

src/dash-table/derived/header/content.tsx

@@ -101,7 +101,10 @@ function doSort(columnId: ColumnId, sortBy: SortBy, mode: SortMode, setProps: Se
 
 function editColumnName(column: IColumn, columns: Columns, columnRowIndex: any, setProps: SetProps, mergeDuplicateHeaders: boolean) {
     return () => {
-        setProps(actions.editColumnName(column, columns, columnRowIndex, mergeDuplicateHeaders));
+        const update = actions.editColumnName(column, columns, columnRowIndex, mergeDuplicateHeaders);
+        if (update) {
+            setProps(update);
+        }
     };
 }
 

src/dash-table/utils/actions.js

@@ -121,5 +121,8 @@ export function changeColumnHeader(column, columns, headerRowIndex, mergeDuplica
 
 export function editColumnName(column, columns, headerRowIndex, mergeDuplicateHeaders) {
     const newColumnName = window.prompt('Enter a new column name');
+    if (newColumnName === null) {
+        return null;
+    }
     return changeColumnHeader(column, columns, headerRowIndex, mergeDuplicateHeaders, newColumnName);
 }