Do not show contact address in subtitle.

src/org/thoughtcrime/securesms/conversation/ConversationTitleView.java

@@ -144,10 +144,14 @@ public class ConversationTitleView extends RelativeLayout {
   private void setContactRecipientTitle(Recipient recipient) {
     this.title.setText(recipient.getName());
 
-    if (recipient.getCustomLabel() != null) this.subtitle.setText(recipient.getCustomLabel());
-    else                                    this.subtitle.setText(recipient.getAddress().serialize());
-
-    this.subtitle.setVisibility(View.VISIBLE);
-    this.subtitleContainer.setVisibility(VISIBLE);
+    if (TextUtils.isEmpty(recipient.getCustomLabel())) {
+      this.subtitle.setText(null);
+      this.subtitle.setVisibility(View.GONE);
+      this.subtitleContainer.setVisibility(View.GONE);
+    } else {
+      this.subtitle.setText(recipient.getCustomLabel());
+      this.subtitle.setVisibility(View.VISIBLE);
+      this.subtitleContainer.setVisibility(View.VISIBLE);
+    }
   }
 }