Implement various null checks

src/main/java/wtf/beatrice/hidekobot/commands/base/Trivia.java

@@ -61,9 +61,13 @@ public class Trivia
 
     public static MessageResponse generateMainScreen()
     {
-        // todo null checks
         JSONObject categoriesJson = Trivia.fetchJson(Trivia.getCategoriesLink());
+        if(categoriesJson == null)
+            return new MessageResponse("Error fetching trivia!", null); // todo nicer with emojis
         List<TriviaCategory> categories = Trivia.parseCategories(categoriesJson);
+        if(categories.isEmpty())
+            return new MessageResponse("Error parsing trivia categories!", null); // todo nicer with emojis
+        
         categories.sort(new TriviaCategoryComparator());
 
         EmbedBuilder embedBuilder = new EmbedBuilder();

src/main/java/wtf/beatrice/hidekobot/commands/base/UserPunishment.java

@@ -166,6 +166,7 @@ public class UserPunishment
         Duration duration = null;
 
         AuditableRestAction<Void> punishmentAction = null;
+        boolean impossible = false;
 
         try {
             switch (punishmentType) {
@@ -197,6 +198,14 @@ public class UserPunishment
                 }
             }
         } catch (RuntimeException ignored) {
+            impossible = true;
+        }
+
+        if(punishmentAction == null)
+            impossible = true;
+
+        if(impossible)
+        {
             // todo nicer looking with emojis
             return new MessageResponse("Sorry, I couldn't " + punishmentTypeName + " " + mentioned.getAsMention() + "!",
                     null);

src/main/java/wtf/beatrice/hidekobot/commands/message/TriviaCommand.java

@@ -5,6 +5,7 @@ import net.dv8tion.jda.api.entities.Message;
 import net.dv8tion.jda.api.entities.channel.concrete.TextChannel;
 import net.dv8tion.jda.api.entities.channel.middleman.MessageChannel;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import net.dv8tion.jda.api.requests.restaction.MessageCreateAction;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import wtf.beatrice.hidekobot.Cache;
@@ -77,11 +78,19 @@ public class TriviaCommand implements MessageCommand
 
         MessageResponse response = Trivia.generateMainScreen();
 
-        event.getMessage().replyEmbeds(response.embed()).addActionRow(response.components()).queue(message ->
+        Message recvMessage = event.getMessage();
-        {
+        MessageCreateAction responseAction = null;
+        if(response.content() != null) responseAction = recvMessage.reply(response.content());
+        else if(response.embed() != null) responseAction = recvMessage.replyEmbeds(response.embed());
+
+        if(responseAction != null) {
+            if(response.components() != null) responseAction = responseAction.addActionRow(response.components());
+
+            responseAction.queue(message -> {
                 Cache.getDatabaseSource().trackRanCommandReply(message, event.getAuthor());
                 Cache.getDatabaseSource().queueDisabling(message);
             });
+        }
 
 
     }