fix: QuickBooks Migrator (#18273)

* fix: Remove unused imports

* style: Remove whitespace before :

* style: Insert whitespace after ,

* style: One import per line

* fix: Remove unused local variable

* style: Remove multiple whitespace after :

* fix: Company might not have any warehouses when on_update hook for QBM is being executed

This used to throw while renaming a Company that is either used with QuickBooks
Migrator or is set as a Default Company in Global Defaults.

erpnext/erpnext_integrations/doctype/quickbooks_migrator/quickbooks_migrator.py

@@ -7,7 +7,9 @@ import frappe
 from frappe import _
 from frappe.model.document import Document
 from requests_oauthlib import OAuth2Session
-import json, requests
+import json
+import requests
+import traceback
 from erpnext import encode_company_abbr
 
 # QuickBooks requires a redirect URL, User will be redirect to this URL
@@ -32,7 +34,6 @@ def callback(*args, **kwargs):
 class QuickBooksMigrator(Document):
 	def __init__(self, *args, **kwargs):
 		super(QuickBooksMigrator, self).__init__(*args, **kwargs)
-		from pprint import pprint
 		self.oauth = OAuth2Session(
 			client_id=self.client_id,
 			redirect_uri=self.redirect_url,
@@ -46,7 +47,9 @@ class QuickBooksMigrator(Document):
 		if self.company:
 			# We need a Cost Center corresponding to the selected erpnext Company
 			self.default_cost_center = frappe.db.get_value('Company', self.company, 'cost_center')
-			self.default_warehouse = frappe.get_all('Warehouse', filters={"company": self.company, "is_group": 0})[0]["name"]
+			company_warehouses = frappe.get_all('Warehouse', filters={"company": self.company, "is_group": 0})
+			if company_warehouses:
+				self.default_warehouse = company_warehouses[0].name
 		if self.authorization_endpoint:
 			self.authorization_url = self.oauth.authorization_url(self.authorization_endpoint)[0]
 
@@ -493,7 +496,7 @@ class QuickBooksMigrator(Document):
 						"account_currency": customer["CurrencyRef"]["value"],
 						"company": self.company,
 					})[0]["name"]
-				except Exception as e:
+				except Exception:
 					receivable_account = None
 				erpcustomer = frappe.get_doc({
 					"doctype": "Customer",
@@ -1252,8 +1255,6 @@ class QuickBooksMigrator(Document):
 
 
 	def _log_error(self, execption, data=""):
-		import json, traceback
-		traceback.print_exc()
 		frappe.log_error(title="QuickBooks Migration Error",
 			message="\n".join([
 				"Data",