Fix restarted secondary instances waiting forever for the templates:compiled message. Fix update notification always appearing when an instance restarts even if there was no update. Closes #4870 (#4871)

loader.js

@@ -29,7 +29,8 @@ var	pidFilePath = __dirname + '/pidfile',
 		css: {
 			cache: undefined,
 			acpCache: undefined
-		}
+		},
+		templatesCompiled: false
 	};
 
 Loader.init = function(callback) {
@@ -112,6 +113,12 @@ Loader.addWorkerEvents = function(worker) {
 						});
 					}
 
+					if (Loader.templatesCompiled && !worker.isPrimary) {
+						worker.send({
+							action: 'templates:compiled'
+						});
+					}
+
 
 				break;
 				case 'restart':
@@ -141,6 +148,8 @@ Loader.addWorkerEvents = function(worker) {
 					}, worker.pid);
 				break;
 				case 'templates:compiled':
+					Loader.templatesCompiled = true;
+
 					Loader.notifyWorkers({
 						action: 'templates:compiled',
 					}, worker.pid);

public/src/app.js

@@ -56,8 +56,8 @@ app.cacheBuster = null;
 
 		socket.removeAllListeners('event:nodebb.ready');
 		socket.on('event:nodebb.ready', function(data) {
-			if (!app.cacheBusters || app.cacheBusters['cache-buster'] !== data['cache-buster']) {
+			if (!app.cacheBuster || app.cacheBuster !== data['cache-buster']) {
-				app.cacheBusters = data;
+				app.cacheBuster = data['cache-buster'];
 
 				app.alert({
 					alert_id: 'forum_updated',