CategoryTool: remove dead code.

product/CMFCategory/CategoryTool.py

@@ -977,8 +977,6 @@ class CategoryTool(BaseTool):
         # Next we look at references
         #LOG("Get Acquired BC", 0, base_category_value.getAcquisitionBaseCategoryList())
         acquisition_base_category_list = base_category_value.getAcquisitionBaseCategoryList()
-        alt_base_category_list = base_category_value.getFallbackBaseCategoryList()
-        all_acquisition_base_category_list = acquisition_base_category_list + alt_base_category_list
         acquisition_pt = base_category_value.getAcquisitionPortalTypeList()
         for my_base_category in acquisition_base_category_list:
           # We implement here special keywords