Fix initialisation error

Summary: There was an initialisation error possible if the crash reporter tried to start with an initial selection (after coming from a deeplink or the notification pane), which would cause an unending update loop.

Reviewed By: passy

Differential Revision: D29331127

fbshipit-source-id: 14e75e483c232039e6a80aa131fa5ce7c105b670

desktop/flipper-plugin/src/ui/data-table/DataTable.tsx

@@ -357,12 +357,16 @@ export function DataTable<T extends object>(
     [dataSource, tableState.sorting],
   );
 
+  const isMounted = useRef(false);
   useEffect(
     function triggerSelection() {
-      onSelect?.(
-        getSelectedItem(dataSource, tableState.selection),
-        getSelectedItems(dataSource, tableState.selection),
-      );
+      if (isMounted.current) {
+        onSelect?.(
+          getSelectedItem(dataSource, tableState.selection),
+          getSelectedItems(dataSource, tableState.selection),
+        );
+      }
+      isMounted.current = true;
     },
     [onSelect, dataSource, tableState.selection],
   );