Add empty constructor to PatriciaTrie

Author: shimmer12

src/main/java/com/thealgorithms/datastructures/tries/PatriciaTrie.java

@@ -33,6 +33,7 @@ private static final class Node<V> {
 
     /** Creates an empty Patricia trie. */
     public PatriciaTrie() {
+        
 +   }
     /**
      * Inserts or updates the value associated with {@code key}.