add db query call for root dirs in product context processor

products/context_processors.py

@@ -1,10 +1,11 @@
 
 from products.forms import ProductSearchForm
+from products.models import ProductCategory
 
 
 def product_search_form(request):
     return {'product_search_form': ProductSearchForm()}
 
 def product_root_categories(request):
-    categories = {'product_root_categories': []}
+    categories = {'product_root_categories': ProductCategory.objects.get_root_categories()}
     return categories