Merge branch 'fix-view-chat-history-in-thread' into 'master'

Make channel optional for toast in post view

See merge request kchat/webapp!929

webapp/channels/src/components/toast_wrapper/index.ts

@@ -37,7 +37,7 @@ export function makeGetRootPosts() {
             return Object.values(allPosts).filter((post) => {
                 return (
                     post.root_id === '' &&
-                    post.channel_id === channel.id &&
+                    post.channel_id === channel?.id &&
                     post.state !== Posts.POST_DELETED
                 );
             }).reduce((map: Record<string, boolean>, obj) => {