Wrap polling function in try finally for safety, fix issue with empty array check and lint

js/modules/loki_public_chat_api.js

@@ -411,6 +411,16 @@ class LokiPublicChannelAPI {
 
   // get channel messages
   async pollForMessages() {
+    try {
+      await this.pollOnceForMessages();
+    } finally {
+      setTimeout(() => {
+        this.pollForMessages();
+      }, GROUPCHAT_POLL_EVERY);
+    }
+  }
+
+  async pollOnceForMessages() {
     const params = {
       include_annotations: 1,
       count: -20,
@@ -437,7 +447,10 @@ class LokiPublicChannelAPI {
         if (adnMessage.is_deleted) {
           return;
         }
-        if (adnMessage.annotations !== []) {
+        if (
+          Array.isArray(adnMessage.annotations) &&
+          adnMessage.annotations.length !== 0
+        ) {
           const noteValue = adnMessage.annotations[0].value;
           ({ from, timestamp, source } = noteValue);
         }
@@ -493,10 +506,6 @@ class LokiPublicChannelAPI {
       });
       conversation.setLastRetrievedMessage(this.lastGot);
     }
-
-    setTimeout(() => {
-      this.pollForMessages();
-    }, GROUPCHAT_POLL_EVERY);
   }
 
   // create a message in the channel

ts/components/conversation/MessageDetail.tsx

@@ -56,18 +56,16 @@ export class MessageDetail extends React.Component<Props> {
   public renderDeleteButton() {
     const { i18n, message } = this.props;
 
-    return (
+    return message.isDeletable ? (
-      message.isDeletable ? (
+      <div className="module-message-detail__delete-button-container">
-        <div className="module-message-detail__delete-button-container">
+        <button
-          <button
+          onClick={message.onDelete}
-            onClick={message.onDelete}
+          className="module-message-detail__delete-button"
-            className="module-message-detail__delete-button"
+        >
-          >
+          {i18n('deleteThisMessage')}
-            {i18n('deleteThisMessage')}
+        </button>
-          </button>
+      </div>
-        </div>
+    ) : null;
-      ) : null
-    );
   }
 
   public renderContact(contact: Contact) {