Fix table panic

src/library/table.rs

@@ -67,7 +67,7 @@ impl Layout for TableNode {
         let stroke = styles.get(Self::STROKE).map(|paint| Stroke { paint, thickness });
         let padding = styles.get(Self::PADDING);
 
-        let cols = self.tracks.x.len();
+        let cols = self.tracks.x.len().max(1);
         let children = self
             .children
             .iter()

tests/typ/layout/table.typ

@@ -7,3 +7,7 @@
   thickness: 2pt,
   [A], [B], [C], [], [], [D \ E \ F \ \ \ G], [H],
 )
+
+---
+// Ref: false
+#table()