2021-06-24-warning-that-category-used-as-navigation-cannot-deleted.md

title	issue
A warning should be created when the category used as navigation wants to be deleted	NEXT-15825

Administration

• Added method isErrorNavigationEntryPoint in src/module/sw-category/component/sw-category-tree/index.js.
• Added method entryPointWarningMessage in src/module/sw-category/component/sw-category-tree/index.js to display a message with an entry point.
• Changed method onDeleteCategory in src/module/sw-category/component/sw-category-tree/index.js.