fix(table): hide empty content if isLoading is true (#2470)

Avoid displaying loadingContent and emptyContent at the same time.
Note that there's an existing issue with loadingContent where if
emptyContent is not provided, it will render loadingContent on top of
the columns (instead of inside the table). This change doesn't fix that,
but rather make isLoading play nice with a provided emptyContent. A
separate fix is still needed for when emptyContent is not provided, which
may affect this change later.

packages/components/table/src/table-body.tsx

@@ -105,7 +105,7 @@ const TableBody = forwardRef<"tbody", TableBodyProps>((props, ref) => {
           colSpan={collection.columnCount}
           role="gridcell"
         >
-          {bodyProps.emptyContent}
+          {!isLoading && bodyProps.emptyContent}
         </td>
       </tr>
     );