[enhancement] Int, Currency, Float, Percent as not null and default to 0

erpnext/controllers/queries.py

@@ -165,7 +165,7 @@ def item_query(doctype, txt, searchfield, start, page_len, filters):
 			concat(substr(tabItem.description, 1, 40), "..."), description) as decription
 		from tabItem
 		where tabItem.docstatus < 2
-			and ifnull(tabItem.has_variants, 0)=0
+			and tabItem.has_variants=0
 			and tabItem.disabled=0
 			and (tabItem.end_of_life > %(today)s or ifnull(tabItem.end_of_life, '0000-00-00')='0000-00-00')
 			and (tabItem.`{key}` LIKE %(txt)s