[muc] Use StanzaCollector.nextResultBlockForever() in MultiUserChat.nextMessage()

smack-experimental/src/main/java/org/jivesoftware/smackx/muclight/MultiUserChatLight.java

@@ -225,7 +225,7 @@ public class MultiUserChatLight {
      * @throws InterruptedException if the calling thread was interrupted.
      */
     public Message nextMessage() throws InterruptedException {
-        return messageCollector.nextResult();
+        return messageCollector.nextResultBlockForever();
     }
 
     /**

smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MultiUserChat.java

@@ -2101,7 +2101,7 @@ public class MultiUserChat {
         if (messageCollector == null) {
             throw new MucNotJoinedException(this);
         }
-        return  messageCollector.nextResult();
+        return  messageCollector.nextResultBlockForever();
     }
 
     /**