diff --git a/radicale/tests/test_base.py b/radicale/tests/test_base.py
index 00b1bd6..f64f1ae 100644
--- a/radicale/tests/test_base.py
+++ b/radicale/tests/test_base.py
@@ -1397,7 +1397,7 @@ class TestMultiFileSystem(BaseFileSystemTest, BaseRequestsMixIn):
         self.propfind("/")
         self.propfind("/created_by_hook/", check=404)
 
-    @pytest.mark.skipif(os.system("type flock") != 0,
+    @pytest.mark.skipif(not shutil.which("flock"),
                         reason="flock command not found")
     def test_hook_storage_locked(self):
         """Verify that the storage is locked when the hook runs."""
@@ -1492,6 +1492,7 @@ class TestCustomStorageSystem(BaseFileSystemTest):
     test_root = BaseRequestsMixIn.test_root
     _report_sync_token = BaseRequestsMixIn._report_sync_token
     # include tests related to sync token
+    s = None
     for s in dir(BaseRequestsMixIn):
         if s.startswith("test_") and ("_sync_" in s or s.endswith("_sync")):
             locals()[s] = getattr(BaseRequestsMixIn, s)
diff --git a/radicale/web/internal_data/fn.js b/radicale/web/internal_data/fn.js
index d19de10..935a574 100644
--- a/radicale/web/internal_data/fn.js
+++ b/radicale/web/internal_data/fn.js
@@ -661,7 +661,7 @@ function CollectionsScene(user, password, collection, onerror) {
         return false;
     }
 
-    function onfileschange(e) {
+    function onfileschange() {
         try {
             let files = filesInput.files;
             if (files.length > 0) {
@@ -729,8 +729,8 @@ function CollectionsScene(user, password, collection, onerror) {
             let href = SERVER + collection.href;
             url_form.href = href;
             url_form.textContent = href;
-            delete_btn.onclick = function(ev) {return ondelete(collection);};
-            edit_btn.onclick = function(ev) {return onedit(collection);};
+            delete_btn.onclick = function() {return ondelete(collection);};
+            edit_btn.onclick = function() {return onedit(collection);};
             node.classList.remove("hidden");
             nodes.push(node);
             template.parentNode.insertBefore(node, template);
@@ -925,7 +925,6 @@ function DeleteCollectionScene(user, password, collection) {
     let error_form = html_scene.querySelector("[data-name=error]");
     let delete_btn = html_scene.querySelector("[data-name=delete]");
     let cancel_btn = html_scene.querySelector("[data-name=cancel]");
-    let no_btn = html_scene.querySelector("[data-name=no]");
 
     /** @type {?number} */ let scene_index = null;
     /** @type {?XMLHttpRequest} */ let delete_req = null;