Bubble up tx signing errors (web3#3105)

* Bubble up tx signing errors

Resolves web3#2062

Author: gabmontes

CHANGELOG.md

@@ -65,4 +65,5 @@ Released with 1.0.0-beta.37 code base.
 - Fix incorrectly populating chainId param with `net_version` when signing txs (#2378)
 - regeneratorRuntime error fixed (#3058)
 - Fix accessing event.name where event is undefined (#3014)
+- Fix bubbling up tx signing errors (#2063, #3105)
 - HttpProvider: CORS issue with Firefox and Safari (#2978)

packages/web3-core-method/src/index.js

@@ -533,7 +533,16 @@ Method.prototype.buildCall = function() {
 
                     // If wallet was found, sign tx, and send using sendRawTransaction
                     if (wallet && wallet.privateKey) {
-                        return method.accounts.signTransaction(_.omit(tx, 'from'), wallet.privateKey).then(sendSignedTx);
+                        return method.accounts.signTransaction(_.omit(tx, 'from'), wallet.privateKey)
+                            .then(sendSignedTx)
+                            .catch(function (err) {
+                                if (_.isFunction(defer.eventEmitter.listeners) && defer.eventEmitter.listeners('error').length) {
+                                    defer.eventEmitter.emit('error', err);
+                                    defer.eventEmitter.removeAllListeners();
+                                    defer.eventEmitter.catch(function () {});
+                                }
+                                defer.reject(err);
+                            });
                     }
 
                     // ETH_SIGN