Add potential missing error handlers

src/js/ripple/remote.js

@@ -1618,6 +1618,12 @@ Remote.prototype._serverPrepareSubscribe = function(callback) {
     self.emit('subscribed');
   };
 
+  request.on('error', function(err) {
+    if (self.trace) {
+      log.info('Initial server subscribe failed', err);
+    }
+  });
+
   request.once('success', serverSubscribed);
 
   self.emit('prepare_subscribe', request);

src/js/ripple/server.js

@@ -134,7 +134,9 @@ function Server(remote, opts) {
       }
     });
 
-    self._request(self._remote.requestServerInfo());
+    var serverInfoRequest = self._remote.requestServerInfo();
+    serverInfoRequest.on('error', function() { });
+    self._request(serverInfoRequest);
   });
 };