addressed some sonar issues

abstracto-application/core/core-impl/src/main/java/dev/sheldan/abstracto/core/config/FeatureListener.java

@@ -21,6 +21,6 @@ public class FeatureListener {
 
     @EventListener
     public void handleContextRefreshEvent(ContextRefreshedEvent ctxStartEvt) {
-
+        // Do nothing yet, because of a race condition between features and commands
     }
 }

abstracto-application/core/core-impl/src/main/java/dev/sheldan/abstracto/core/service/BotServiceBean.java

@@ -177,9 +177,4 @@ public class BotServiceBean implements BotService {
         }
         return null;
     }
-
-    @Override
-    public void shutdown() {
-
-    }
 }

abstracto-application/core/core-impl/src/main/java/dev/sheldan/abstracto/core/service/MessageCacheBean.java

@@ -154,6 +154,7 @@ public class MessageCacheBean implements MessageCache {
                 reactions.add(cachedReaction);
             } catch (InterruptedException | ExecutionException e) {
                 log.error("Error while executing future to retrieve reaction.", e);
+                Thread.currentThread().interrupt();
             }
         });
         return reactions;

abstracto-application/core/core-impl/src/main/java/dev/sheldan/abstracto/core/service/management/ChannelManagementServiceBean.java

@@ -42,7 +42,8 @@ public class ChannelManagementServiceBean implements ChannelManagementService {
                     .build();
             return repository.save(build);
         } else {
-            return loadChannel(id).get();
+            Optional<AChannel> channelOptional = loadChannel(id);
+            return channelOptional.orElse(null);
         }
     }