fix: allow multiple email ids

(cherry picked from commit 423decb93c)

erpnext/accounts/doctype/process_statement_of_accounts/process_statement_of_accounts.py

@@ -262,9 +262,11 @@ def get_recipients_and_cc(customer, doc):
 	recipients = []
 	for clist in doc.customers:
 		if clist.customer == customer:
-			recipients.append(clist.billing_email)
+			for email in clist.billing_email.split(","):
+				recipients.append(email.strip())
 			if doc.primary_mandatory and clist.primary_email:
-				recipients.append(clist.primary_email)
+				for email in clist.primary_email.split(","):
+					recipients.append(email.strip())
 	cc = []
 	if doc.cc_to != "":
 		try: