fixed case where no atom circle is available

src/plugin/depiction.ts

@@ -345,7 +345,6 @@ class Depiction {
             }
         });
         this.parent.dispatchEvent(e);
-
     }
 
     /**

src/plugin/manager.ts

@@ -128,6 +128,8 @@ class Visualization {
         const atom = this.depiction.atoms.filter(x => x.value >0 && x.name === atomName);
         if (atom.length > 0) {
             this.depiction.atomMouseEnterEventHandler(atom[0]);
+        } else {
+            this.depiction.atomMouseLeaveEventHandler();
         }
     }