fix(crm): render Lead Details address consistently across engines

The Lead Details report concatenated address_line1 and address_line2 with
CONCAT_WS. An unfilled optional Data field is stored as '' on MariaDB but as
NULL on PostgreSQL; CONCAT_WS keeps the empty string (leaving a trailing
", ") on MariaDB while Postgres drops the NULL, so the same lead rendered a
different address on each engine.

Wrap both parts in NULLIF(part, '') so empty values are treated as NULL on
both engines: the report now produces the same clean address (no trailing
separator) everywhere.

erpnext/crm/report/lead_details/lead_details.py

@@ -4,7 +4,7 @@
 
 import frappe
 from frappe import _
-from frappe.query_builder.functions import Concat_ws, Date
+from frappe.query_builder.functions import Concat_ws, Date, NullIf
 
 
 def execute(filters=None):
@@ -93,7 +93,9 @@ def get_data(filters):
 			lead.phone,
 			lead.owner,
 			lead.company,
-			(Concat_ws(", ", address.address_line1, address.address_line2)).as_("address"),
+			(Concat_ws(", ", NullIf(address.address_line1, ""), NullIf(address.address_line2, ""))).as_(
+				"address"
+			),
 			address.pincode,
 			address.city,
 			address.state,

erpnext/crm/report/lead_details/test_lead_details.py

@@ -0,0 +1,36 @@
+# Copyright (c) 2024, Frappe Technologies Pvt. Ltd. and contributors
+# For license information, please see license.txt
+
+import frappe
+from frappe.utils import add_days, today
+
+from erpnext.crm.report.lead_details.lead_details import get_data
+from erpnext.tests.utils import ERPNextTestSuite
+
+
+class TestLeadDetailsReport(ERPNextTestSuite):
+	def test_address_column_omits_empty_line(self):
+		"""An empty address_line2 is '' on MariaDB but NULL on Postgres; CONCAT_WS
+		keeps the empty string (trailing ', ') on MariaDB while Postgres drops it.
+		The report must render the same clean address on both engines."""
+		lead = frappe.get_doc(
+			{"doctype": "Lead", "lead_name": "_Test PG Lead Address", "company": "_Test Company"}
+		).insert()
+		frappe.get_doc(
+			{
+				"doctype": "Address",
+				"address_title": "_Test PG Lead Address",
+				"address_type": "Billing",
+				"address_line1": "221B Baker Street",
+				"address_line2": "",
+				"city": "London",
+				"country": "United Kingdom",
+				"links": [{"link_doctype": "Lead", "link_name": lead.name}],
+			}
+		).insert()
+
+		filters = frappe._dict(
+			company="_Test Company", from_date=add_days(today(), -1), to_date=add_days(today(), 1)
+		)
+		row = next(r for r in get_data(filters) if r.get("name") == lead.name)
+		self.assertEqual(row.get("address"), "221B Baker Street")