Just updated to LO 5.1.0.3, including the Help Pack Installer, from 5.02. Under Tools - Options - LibreOffice - General, the setting for "Allow to save document even when the document is not modified" is no longer there. There is a new setting called "Printing sets "document modified" status." I looked in Help for that menu and it describes both options. Can "Allow to save document even when the document is not modified" be added back?
That option was removed on purpose. See https://cgit.freedesktop.org/libreoffice/core/commit/?h=libreoffice-5-1&id=677197b3459df2c89be32595e0cb1b8b3e144c69 And the “modified-document status” setting is not new. I will remove the mention to the removed option from the help soon.
Adolfo Jayme Barrientos committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/help/commit/?id=97ecbd0f9d9668e0abdbb7efd0e59603931951f9 tdf#98122 Rip out mention of the option “AlwaysAllowSave”
Adolfo Jayme Barrientos committed a patch related to this issue. It has been pushed to "libreoffice-5-1": http://cgit.freedesktop.org/libreoffice/help/commit/?id=32494e774e5e99a58ad49ce90d18c33264d0a00d&h=libreoffice-5-1 tdf#98122 Rip out mention of the option “AlwaysAllowSave”