Comply to the new rules

js/tests/unit/popover.js

@@ -32,8 +32,8 @@ $(function () {
     $el.bootstrapPopover()
     try {
       $el.bootstrapPopover('noMethod')
-    } catch (err) {
-      assert.strictEqual(err.message, 'No method named "noMethod"')
+    } catch (error) {
+      assert.strictEqual(error.message, 'No method named "noMethod"')
     }
   })
 
@@ -369,8 +369,8 @@ $(function () {
 
     try {
       $('<div data-toggle="popover" data-title="some title" data-content="@Johann-S" style="display: none"/>').bootstrapPopover('show')
-    } catch (err) {
-      assert.strictEqual(err.message, 'Please use show on visible elements')
+    } catch (error) {
+      assert.strictEqual(error.message, 'Please use show on visible elements')
       done()
     }
   })