Fix a crash when forwarding tags

app/src/main/java/app/fedilab/android/mastodon/ui/drawer/ComposeAdapter.java

@@ -1646,6 +1646,7 @@ public class ComposeAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
                 }
             } else if (forwardTag && position > 0 && statusDraft.text != null && statusDraft.text.contains("#") && !statusList.get(position).tagAdded) {
                 Status status = statusList.get(position - 1).reblog == null ? statusList.get(position - 1) : statusList.get(position - 1).reblog;
+                if (status.tags != null && status.tags.size() > 0) {
                     statusList.get(position).tagAdded = true;
                     int lenght = 0;
                     for (Tag tag : status.tags) {
@@ -1655,6 +1656,7 @@ public class ComposeAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
                     statusDraft.setCursorToEnd = false;
                     holder.binding.content.setSelection(statusDraft.text.length() - lenght - 3);
                 }
+            }
 
             if (statusDraft.spoiler_text != null) {
                 holder.binding.contentSpoiler.setText(statusDraft.spoiler_text);