check blockHash (web3#1243)

Author: 7flash

lib/web3/contract.js

@@ -117,7 +117,7 @@ var checkForContractAddress = function(contract, callback){
             } else {
 
                 contract._eth.getTransactionReceipt(contract.transactionHash, function(e, receipt){
-                    if(receipt && !callbackFired) {
+                    if(receipt && receipt.blockHash && !callbackFired) {
 
                         contract._eth.getCode(receipt.contractAddress, function(e, code){
                             /*jshint maxcomplexity: 6 */
@@ -178,7 +178,7 @@ var ContractFactory = function (eth, abi) {
      */
     this.new = function () {
         /*jshint maxcomplexity: 7 */
-        
+
         var contract = new Contract(this.eth, this.abi);
 
         // parse arguments