added getTargetNote to froca's attribute, fixes #2981

docs/frontend_api/Attribute.html

@@ -727,6 +727,108 @@ and relation (representing named relationship between source and target note)</d
 
 
         
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+    <h4 class="name" id="getTargetNote"><span class="type-signature">(async) </span>getTargetNote<span class="signature">()</span><span class="type-signature"> &rarr; {Promise.&lt;<a href="NoteShort.html">NoteShort</a>>}</span></h4>
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+<dl class="details">
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+    <dt class="tag-source">Source:</dt>
+    <dd class="tag-source"><ul class="dummy"><li>
+        <a href="entities_attribute.js.html">entities/attribute.js</a>, <a href="entities_attribute.js.html#line37">line 37</a>
+    </li></ul></dd>
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+<h5>Returns:</h5>
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+        Type
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+<span class="param-type">Promise.&lt;<a href="NoteShort.html">NoteShort</a>></span>
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docs/frontend_api/entities_attribute.js.html

@@ -61,8 +61,19 @@ class Attribute {
         return this.froca.notes[this.noteId];
     }
 
+    /** @returns {Promise<NoteShort>} */
+    async getTargetNote() {
+        const targetNoteId = this.targetNoteId;
+
+        return await this.froca.getNote(targetNoteId, true);
+    }
+
     get targetNoteId() { // alias
-        return this.type === 'relation' ? this.value : undefined;
+        if (this.type !== 'relation') {
+            throw new Error(`Attribute ${this.attributeId} is not a relation`);
+        }
+
+        return this.value;
     }
 
     get isAutoLink() {