Ensure an alert is shown when publication sections are missing

src/lib/components/Publication.svelte

@@ -29,7 +29,7 @@
 
   // TODO: Test load handling.
 
-  let leaves = $state<NDKEvent[]>([]);
+  let leaves = $state<Array<NDKEvent | null>>([]);
   let isLoading = $state<boolean>(false);
   let isDone = $state<boolean>(false);
   let lastElementRef = $state<HTMLElement | null>(null);
@@ -48,16 +48,6 @@
         break;
       }
 
-      if (value == null) {
-        isLoading = false;
-        break;
-      }
-
-      if (leaves.includes(value)) {
-        isLoading = false;
-        break;
-      }
-      
       leaves.push(value);
     }
 

src/lib/components/PublicationSection.svelte

@@ -14,7 +14,7 @@
   }: {
     address: string,
     rootAddress: string,
-    leaves: NDKEvent[],
+    leaves: Array<NDKEvent | null>,
     ref: (ref: HTMLElement) => void,
   } = $props();
 

src/lib/data_structures/publication_tree.ts

@@ -345,11 +345,19 @@ export class PublicationTree implements AsyncIterable<NDKEvent | null> {
           continue;
         }
 
+        if (this.#cursor.target!.status === PublicationTreeNodeStatus.Error) {
+          return { done: false, value: null };
+        }
+
         const event = await this.getEvent(this.#cursor.target!.address);
         return { done: false, value: event };
       }
     } while (this.#cursor.tryMoveToParent());
 
+    if (this.#cursor.target!.status === PublicationTreeNodeStatus.Error) {
+      return { done: false, value: null };
+    }
+
     // If we get to this point, we're at the root node (can't move up any more).
     return { done: true, value: null };
   }
@@ -370,11 +378,19 @@ export class PublicationTree implements AsyncIterable<NDKEvent | null> {
           continue;
         }
 
+        if (this.#cursor.target!.status === PublicationTreeNodeStatus.Error) {
+          return { done: false, value: null };
+        }
+
         const event = await this.getEvent(this.#cursor.target!.address);
         return { done: false, value: event };
       }
     } while (this.#cursor.tryMoveToParent());
 
+    if (this.#cursor.target!.status === PublicationTreeNodeStatus.Error) {
+      return { done: false, value: null };
+    }
+
     return { done: true, value: null };
   }