Web Interface improvements and bug fixes

- Added button for random sounds to each category
- Visual improvements on category separation and a lot more (thanks, Pixeljockey)
- Crash bug fix on playing random sounds with commands without soundnames

main.go

@@ -281,10 +281,15 @@ func enqueuePlay(user *discordgo.User, guild *discordgo.Guild, coll *SoundCollec
 	if play == nil {
 		return
 	}
-	log.WithFields(log.Fields{
-		"user": user,
-	}).Info(user.Username + " triggered sound playback of \"!" + coll.Prefix + " " + sound.Name + "\" for server " + guild.Name + " in channel " + play.ChannelID)
-
+	if sound != nil {
+		log.WithFields(log.Fields{
+			"user": user,
+		}).Info(user.Username + " triggered sound playback of !" + coll.Prefix + " " + sound.Name + " for server " + guild.Name + " in channel " + play.ChannelID)
+	} else {
+		log.WithFields(log.Fields{
+			"user": user,
+		}).Info(user.Username + " triggered sound playback of !" + coll.Prefix + " for server " + guild.Name + " in channel " + play.ChannelID)
+	}
 	// Check if we already have a connection to this guild
 	// this should be threadsafe
 	mutex.Lock()
@@ -548,6 +553,7 @@ func findSoundAndCollection(command string, soundname string) (*Sound, *SoundCol
 					return s, c
 				}
 			}
+			return nil, c
 		}
 	}
 	return nil, nil