handle cmd error

lib/cmds/blockchain/geth_commands.js

@@ -153,6 +153,9 @@ GethCommands.prototype.mainCommand = function(address, done) {
       callback(null, "");
     }
   ], function(err, results) {
+    if (err) {
+      throw new Error(err.message);
+    }
     done(self.geth_bin + " " + results.join(" "));
   });
 };