Fix replies to webhooks (#1080)

Author: Nincodedo

ninbot-app/src/main/java/dev/nincodedo/ninbot/components/reaction/processor/PreviousContent.java

@@ -18,6 +18,8 @@ public void execute(ReactionContext reactionContext) {
                 reactionContext.setCanReact(false);
             }
             reactionMessage = reactionMessage.replace(getReplaceTarget(), previousMessageContent);
+        } else if (lastMessageOptional.isEmpty()) {
+            reactionContext.setCanReact(false);
         }
         reactionContext.setReactionMessage(reactionMessage);
     }

ninbot-app/src/main/java/dev/nincodedo/ninbot/components/reaction/processor/ReactionRule.java

@@ -25,11 +25,6 @@ default Optional<Message> getPreviousMessage(MessageChannel channel, Message mes
         if (message.getReferencedMessage() != null) {
             return Optional.of(message.getReferencedMessage());
         }
-        var messageHistory = channel.getHistoryBefore(message, 1).complete().getRetrievedHistory();
-        if (!messageHistory.isEmpty() && !messageHistory.get(0).isWebhookMessage()) {
-            return Optional.of(messageHistory.get(0));
-        } else {
-            return Optional.empty();
-        }
+        return channel.getHistoryBefore(message, 1).complete().getRetrievedHistory().stream().findFirst();
     }
 }