[FIX] Old Data Migrations breaking upgrades (#18185)

server/startup/migrations/v185.js

@@ -9,7 +9,7 @@ Migrations.add({
 	version: 185,
 	up() {
 		const setting = Settings.findOne({ _id: 'Message_SetNameToAliasEnabled' });
-		if (setting.value) {
+		if (setting && setting.value) {
 			Settings.update({ _id: 'UI_Use_Real_Name' }, {
 				$set: {
 					value: true,

server/startup/migrations/v187.js

@@ -61,6 +61,13 @@ Migrations.add({
 		Settings.remove({ _id: 'Push_debug' });
 		Settings.remove({ _id: 'Notifications_Always_Notify_Mobile' });
 
-		Promise.await(migrateNotifications());
+		try {
+			Promise.await(migrateNotifications());
+		} catch (err) {
+			// Ignore if the collection does not exist
+			if (!err.code || err.code !== 26) {
+				throw err;
+			}
+		}
 	},
 });