Fix TableRow with no children throws unnamed assertion (#123770)

Fix `TableRow` with no children throws unnamed assertion

Author: TahaTesser

packages/flutter/lib/src/widgets/table.dart

@@ -144,6 +144,12 @@ class Table extends RenderObjectWidget {
                'Otherwise, the table will contain holes.',
              );
            }
+           if (children.any((TableRow row) => row.children.isEmpty)) {
+             throw FlutterError(
+               'One or more TableRow have no children.\n'
+               'Every TableRow in a Table must have at least one child, so there is no empty row. ',
+             );
+           }
          }
          return true;
        }()),

packages/flutter/test/widgets/table_test.dart

@@ -45,6 +45,7 @@ void main() {
       ),
     );
   });
+
   testWidgets('Table widget - control test', (WidgetTester tester) async {
     Future<void> run(TextDirection textDirection) async {
       await tester.pumpWidget(
@@ -1033,5 +1034,50 @@ void main() {
     expect(find.text('Hello'), findsOneWidget);
   });
 
+  testWidgets('TableRow with no children throws an error message', (WidgetTester tester) async {
+    // Regression test for https://github.com/flutter/flutter/issues/119541.
+    String result = 'no exception';
+
+    // Test TableRow with children.
+    try {
+      await tester.pumpWidget(Directionality(
+        textDirection: TextDirection.ltr,
+        child: Table(
+          children: const <TableRow>[
+            TableRow(
+              children: <Widget>[
+                Text('A'),
+              ],
+            ),
+          ],
+        ),
+      ));
+    } on FlutterError catch (e) {
+      result = e.toString();
+    }
+
+    expect(result, 'no exception');
+
+    // Test TableRow with no children.
+    try {
+      await tester.pumpWidget(Directionality(
+        textDirection: TextDirection.ltr,
+        child: Table(
+          children: const <TableRow>[
+            TableRow(),
+          ],
+        ),
+      ));
+    } on FlutterError catch (e) {
+      result = e.toString();
+    }
+
+    expect(
+      result,
+      'One or more TableRow have no children.\n'
+      'Every TableRow in a Table must have at least one child, so there is no empty row.',
+    );
+  });
+
   // TODO(ianh): Test handling of TableCell object
 }