fixed filteredTxsHash If there is only one hash the filter do not match any txs in the block and should return a void aray

lib/block/merkleblock.js

@@ -155,7 +155,7 @@ MerkleBlock.prototype.validMerkleTree = function validMerkleTree() {
  * Return a list of all the txs hash that match the filter
  * @returns {Array} - txs hash that match the filter
  */
-MerkleBlock.prototype.filterdTxsHash = function validMerkleTree() {
+MerkleBlock.prototype.filterdTxsHash = function filterdTxsHash() {
   $.checkState(_.isArray(this.flags), 'MerkleBlock flags is not an array');
   $.checkState(_.isArray(this.hashes), 'MerkleBlock hashes is not an array');
 
@@ -169,6 +169,11 @@ MerkleBlock.prototype.filterdTxsHash = function validMerkleTree() {
     throw new errors.MerkleBlock.InvalidMerkleTree();
   }
 
+  // If there is only one hash the filter do not match any txs in the block
+  if(this.hashes.length === 1) {
+    return [];
+  };
+
   var height = this._calcTreeHeight();
   var opts = { hashesUsed: 0, flagBitsUsed: 0 };
   var txs = this._traverseMerkleTree(height, 0, opts, true);