Moving reaction check to appropriate place

src/channel_state.js

@@ -109,11 +109,6 @@ export class ChannelState {
 	}
 
 	addReaction(reaction, message) {
-		// Don't do anything if reaction already exist.
-		if (this.hasReaction(reaction, message)) {
-			return;
-		}
-
 		const { messages } = this;
 		if (!message) return;
 		const { parent_id, show_in_channel } = message;
@@ -162,6 +157,11 @@ export class ChannelState {
 			return false;
 		}
 
+		// Don't do anything if reaction already exist.
+		if (this.hasReaction(reaction, message)) {
+			return;
+		}
+
 		message = this._removeReactionFromMessage(message, reaction);
 		if (this._channel.getClient().userID === reaction.user.id) {
 			message = message.update('own_reactions', (old = []) =>