Cleanup comments tree when cleaning up SDK.

Author: winrid

libraries/sdk/src/main/java/com/fastcomments/sdk/CommentsTree.java

@@ -991,5 +991,8 @@ public void clear() {
         newRootComments.clear();
         newRootCommentsButton = null;
         userPresenceCache.clear();
+        if (adapter != null) {
+            adapter = null;
+        }
     }
 }

libraries/sdk/src/main/java/com/fastcomments/sdk/FastCommentsSDK.java

@@ -1144,6 +1144,10 @@ public void cleanup() {
         tenantIdWS = null;
         urlIdWS = null;
         userIdWS = null;
+
+        if (commentsTree != null) {
+            commentsTree.clear();
+        }
     }
 
     /**