Fix SingleFieldList story

Author: djhi

packages/ra-ui-materialui/src/list/SingleFieldList.stories.tsx

@@ -128,7 +128,7 @@ export const Loading = () => (
 );
 
 export const Offline = () => (
-    <Wrapper listContext={{ isPaused: true }}>
+    <Wrapper listContext={{ isPaused: true, data: null, total: null }}>
         <SingleFieldList />
     </Wrapper>
 );

packages/ra-ui-materialui/src/list/SingleFieldList.tsx

@@ -90,7 +90,7 @@ export const SingleFieldList = (inProps: SingleFieldListProps) => {
 
         return null;
     }
-    if (isPaused && (isPlaceholderData || data == null)) {
+    if (isPaused && (isPlaceholderData || total == null)) {
         if (offline) {
             return offline;
         }