Merge pull request #782 from ethereum/invalidAddress

Try catch on sendTransaction (metamask can throw)

src/app/execution/txRunner.js

@@ -64,6 +64,7 @@ TxRunner.prototype.execute = function (args, callback) {
         }
         tx.gas = gasEstimation
         var sendTransaction = self.personalMode ? executionContext.web3().personal.sendTransaction : executionContext.web3().eth.sendTransaction
+        try {
           sendTransaction(tx, function (err, resp) {
             if (err) {
               return callback(err, resp)
@@ -71,6 +72,9 @@ TxRunner.prototype.execute = function (args, callback) {
 
             tryTillResponse(resp, callback)
           })
+        } catch (e) {
+          return callback(`Send transaction failed: ${e.message} . if you use an injected provider, please check it is properly unlocked. `)
+        }
       })
     }
   } else {