[client] Show errors sent by the server in the console.

Nibriboard/Client/NibriClient.cs

@@ -378,7 +378,7 @@ namespace Nibriboard.Client
 			if(CurrentPlane == null)
 			{
 				Send(new ErrorMessage() {
-					Message = "Error: You can't complete a line until you've selected a plane" +
+					Message = "Error: You can't complete a line until you've selected a plane " +
 						"to draw it on!"
 				});
 				return;

Nibriboard/ClientFiles/RippleLink.js

@@ -22,6 +22,7 @@ class RippleLink extends EventEmitter
 		
 		// Respond to heartbeats from the server
 		this.on("Heartbeat", this.handleHeartbeat.bind(this));
+		this.on("Error", this.handleErrorMessage.bind(this));
 		
 		// Close the socket correctly
 		window.addEventListener("beforeunload", (function(event) {
@@ -49,6 +50,10 @@ class RippleLink extends EventEmitter
 		this.emit(message.Event, message);
 	}
 	
+	handleErrorMessage(message) {
+		console.error(message.Message);
+	}
+	
 	/**
 	 * Replies to heartbeat messages from the server.
 	 */