app.portBindings and newManifest.tcpPorts may be null

src/mail_templates/app_update_available.ejs

@@ -0,0 +1,15 @@
+<%if (format === 'text') { %>
+
+Dear Admin,
+
+A new version of the app '<%= app.manifest.title %>' installed at <%= app.fqdn %> is available!
+
+Please update at your convenience at <%= webadminUrl %>.
+
+Thank you,
+Update Manager
+
+<% } else { %>
+
+<% } %>
+