Refactored to require handlers to specify the components they rely on and to specify when they are ready. This fixes a lot of bugs with the UI when users try to press buttons while the application is still loading.

src/models/stateful_table.rs

@@ -302,4 +302,8 @@ where
   pub fn reset_search(&mut self) {
     self.search = None;
   }
+
+  pub fn is_empty(&self) -> bool {
+    self.items.is_empty()
+  }
 }