[minor] chart_of_accounts.py for python3
diff --git a/erpnext/accounts/doctype/account/chart_of_accounts/chart_of_accounts.py b/erpnext/accounts/doctype/account/chart_of_accounts/chart_of_accounts.py
index 845949b..919f53b 100644
--- a/erpnext/accounts/doctype/account/chart_of_accounts/chart_of_accounts.py
+++ b/erpnext/accounts/doctype/account/chart_of_accounts/chart_of_accounts.py
@@ -44,9 +44,9 @@
 
 					if root_account or frappe.local.flags.allow_unverified_charts:
 						account.flags.ignore_mandatory = True
-						
+
 					account.flags.ignore_permissions = True
-					
+
 					account.insert()
 
 					accounts.append(account_name_in_db)
@@ -82,7 +82,7 @@
 	chart = {}
 	if existing_company:
 		return get_account_tree_from_existing_company(existing_company)
-	
+
 	elif chart_template == "Standard":
 		from erpnext.accounts.doctype.account.chart_of_accounts.verified import standard_chart_of_accounts
 		return standard_chart_of_accounts.get()
@@ -123,6 +123,8 @@
 
 		for folder in folders:
 			path = os.path.join(os.path.dirname(__file__), folder)
+			if not os.path.exists(path):
+				continue
 
 			for fname in os.listdir(path):
 				fname = frappe.as_unicode(fname)
@@ -130,6 +132,7 @@
 					with open(os.path.join(path, fname), "r") as f:
 						_get_chart_name(f.read())
 
+	# if more than one charts, returned then add the standard
 	if len(charts) != 1 or with_standard:
 		charts += ["Standard", "Standard with Numbers"]
 
@@ -154,7 +157,7 @@
 	# find children
 	parent_account = parent.name if parent else ""
 	children = [acc for acc in all_accounts if cstr(acc.parent_account) == parent_account]
-			
+
 	# if no children, but a group account
 	if not children and parent.is_group:
 		tree["is_group"] = 1
@@ -164,7 +167,7 @@
 	for child in children:
 		# start new subtree
 		tree[child.account_name] = {}
-		
+
 		# assign account_type and root_type
 		if child.account_number:
 			tree[child.account_name]["account_number"] = child.account_number
@@ -174,7 +177,7 @@
 			tree[child.account_name]["tax_rate"] = child.tax_rate
 		if not parent:
 			tree[child.account_name]["root_type"] = child.root_type
-			
+
 		# call recursively to build a subtree for current account
 		build_account_tree(tree[child.account_name], child, all_accounts)
 
@@ -182,7 +185,7 @@
 def validate_bank_account(coa, bank_account):
 	accounts = []
 	chart = get_chart(coa)
-	
+
 	if chart:
 		def _get_account_names(account_master):
 			for account_name, child in iteritems(account_master):