Compat fixes

app/js/lib/ng_utils.js

@@ -2092,6 +2092,9 @@ angular.module('izhukov.utils', [])
     }
 
     function setUpServiceWorkerChannel() {
+      if (!isAvailable) {
+        return
+      }
       navigator.serviceWorker.addEventListener('message', function(event) {
         if (event.data &&
             event.data.type == 'push_click') {

app/partials/desktop/im.html

@@ -238,9 +238,9 @@
                     </div>
 
                     <div class="im_send_buttons_wrap clearfix">
-                      <button type="submit" class="btn btn-md im_submit nocopy" ng-class="draftMessage.type == 'edit' ? 'im_submit_edit' : 'im_submit_send'">
-                        <span class="im_submit_send_label" my-i18n="im_submit_message"></span>
-                        <span class="im_submit_edit_label" my-i18n="im_submit_edit_message"></span>
+                      <button type="submit" class="btn btn-md im_submit" ng-class="draftMessage.type == 'edit' ? 'im_submit_edit' : 'im_submit_send'">
+                        <span class="im_submit_send_label nocopy" my-i18n="im_submit_message"></span>
+                        <span class="im_submit_edit_label nocopy" my-i18n="im_submit_edit_message"></span>
                       </button>
 
                       <div class="im_attach pull-left">