fixed inconsistent tab error (#13339)

diff --git a/erpnext/projects/doctype/project_update/project_update.py b/erpnext/projects/doctype/project_update/project_update.py
index 8b4249f..faa4bf1 100644
--- a/erpnext/projects/doctype/project_update/project_update.py
+++ b/erpnext/projects/doctype/project_update/project_update.py
@@ -36,7 +36,7 @@
     msg += "</table>"
     if len(holiday) == 0:
         email = frappe.db.sql("""SELECT user from `tabProject User` WHERE parent = %s;""", project_name)
-    	for emails in email:
-    		frappe.sendmail(recipients=emails,subject=frappe._(project_name + ' ' + 'Summary'),message = msg)
+        for emails in email:
+            frappe.sendmail(recipients=emails,subject=frappe._(project_name + ' ' + 'Summary'),message = msg)
     else:
     	pass
\ No newline at end of file