fix: Discount Filters and Web templates

- Fixed discount filters (didn’t work after js render change)
- Fix Item Card Group template height and style
- Add placeholder to missing images in Product Category Cards template
- Code cleanup
diff --git a/erpnext/templates/pages/customer_reviews.py b/erpnext/templates/pages/customer_reviews.py
index 3bb0142..b9c8a01 100644
--- a/erpnext/templates/pages/customer_reviews.py
+++ b/erpnext/templates/pages/customer_reviews.py
@@ -1,15 +1,13 @@
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
 # License: GNU General Public License v3. See license.txt
-from __future__ import unicode_literals
-
-no_cache = 1
-
 import frappe
 from erpnext.e_commerce.doctype.item_review.item_review import get_item_reviews
 
 def get_context(context):
+	context.no_cache = 1
 	context.full_page = True
 	context.reviews = None
+
 	if frappe.form_dict and frappe.form_dict.get("item_code"):
 		context.item_code = frappe.form_dict.get("item_code")
 		context.web_item = frappe.db.get_value("Website Item", {"item_code": context.item_code}, "name")