Fix ListEmptyComponent is rendered upside down when using inverted fl…

…ag. (#21496)

Summary:
Fix ListEmptyComponent is rendered upside down when using inverted flag.

Fixes #21196
Pull Request resolved: #21496

Differential Revision: D13334437

Pulled By: hramos

fbshipit-source-id: b34a9a0a153862d3d5dbe410ab0a6c66a8cfcffd

Libraries/Lists/VirtualizedList.js

@@ -934,7 +934,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
           : this.props.inverted,
       stickyHeaderIndices,
     };
-    if (inversionStyle) {
+    if (inversionStyle && itemCount !== 0) {
       /* $FlowFixMe(>=0.70.0 site=react_native_fb) This comment suppresses an
        * error found when Flow v0.70 was deployed. To see the error delete
        * this comment and run Flow. */