fix load ligand view if bound molecule is just a ligand

src/plugin/model.ts

@@ -388,7 +388,8 @@ namespace Model {
                 }
             });
 
-            this.interactionNodes = Array.from(this.tmpNodesSet.values());
+            this.residues = Array.from(this.tmpResidueSet)
+            this.interactionNodes = Array.from(this.tmpNodesSet);
 
             return this;
         }