Add marker for unknown metadata.

diff --git a/src/main/java/net/pterodactylus/sonitus/data/Metadata.java b/src/main/java/net/pterodactylus/sonitus/data/Metadata.java
index 91acad4..61c0100 100644 (file)
--- a/src/main/java/net/pterodactylus/sonitus/data/Metadata.java
+++ b/src/main/java/net/pterodactylus/sonitus/data/Metadata.java
@@ -30,6 +30,9 @@ import com.google.common.base.Optional;
  */
 public class Metadata {
 
+       /** Marker for unknown metadata. */
+       public static final Metadata UNKNOWN = new Metadata();
+
        /** The format metadata. */
        private final FormatMetadata formatMetadata;