Merge pull request #19421 from rohitwaghchaure/account_not_set_for_dasboard_chart_v12

fix: 'NoneType' object is not iterable
diff --git a/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py b/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py
index bc07b6d..d098d84 100644
--- a/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py
+++ b/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py
@@ -3,6 +3,7 @@
 
 from __future__ import unicode_literals
 import frappe, json
+from frappe import _
 from frappe.utils import add_to_date, date_diff, getdate, nowdate, get_last_day, formatdate
 from erpnext.accounts.report.general_ledger.general_ledger import execute
 from frappe.core.page.dashboard.dashboard import cache_source, get_from_date_from_timespan
@@ -24,6 +25,9 @@
 	account = filters.get("account")
 	company = filters.get("company")
 
+	if not account and chart:
+		frappe.throw(_("Account is not set for the dashboard chart {0}").format(chart))
+
 	if not to_date:
 		to_date = nowdate()
 	if not from_date:
diff --git a/erpnext/setup/doctype/company/company.py b/erpnext/setup/doctype/company/company.py
index e69a6aad..8b42b19 100644
--- a/erpnext/setup/doctype/company/company.py
+++ b/erpnext/setup/doctype/company/company.py
@@ -33,6 +33,10 @@
 		return exists
 
 	def validate(self):
+		self.update_default_account = False
+		if self.is_new():
+			self.update_default_account = True
+
 		self.validate_abbr()
 		self.validate_default_accounts()
 		self.validate_currency()
@@ -203,8 +207,8 @@
 				"default_expense_account": "Cost of Goods Sold"
 			})
 
-		for default_account in default_accounts:
-			if self.is_new() or frappe.flags.in_test or frappe.flags.in_demo:
+		if self.update_default_account or frappe.flags.in_test:
+			for default_account in default_accounts:
 				self._set_default_account(default_account, default_accounts.get(default_account))
 
 		if not self.default_income_account: