rm empty block

Author: lengyijun

src/priority_queue/mod.rs

@@ -730,13 +730,6 @@ where
     }
 }
 
-impl<I, P, H> PriorityQueue<I, P, H>
-where
-    P: Ord,
-    I: Hash + Eq,
-{
-}
-
 impl<I, P, H> PriorityQueue<I, P, H>
 where
     P: Ord,