fix: unecessary keyword args were passed in mapper functions (#27563) (#27565)

(cherry picked from commit e03d9aa889)

Co-authored-by: Saqib <nextchamp.saqib@gmail.com>

erpnext/public/js/utils.js

@@ -719,7 +719,10 @@ erpnext.utils.map_current_doc = function(opts) {
 					return;
 				}
 				opts.source_name = values;
+				if (opts.allow_child_item_selection) {
+					// args contains filtered child docnames
 					opts.args = args;
+				}
 				d.dialog.hide();
 				_map();
 			},

erpnext/stock/doctype/material_request/material_request.py

@@ -272,8 +272,9 @@ def update_status(name, status):
 	material_request.update_status(status)
 
 @frappe.whitelist()
-def make_purchase_order(source_name, target_doc=None, args={}):
-
+def make_purchase_order(source_name, target_doc=None, args=None):
+	if args is None:
+		args = {}
 	if isinstance(args, string_types):
 		args = json.loads(args)