Edouard Tisserant [Tue, 11 Feb 2020 13:56:48 +0100] rev 2707
XSLTransform.py: added get_error_log()
Edouard Tisserant [Mon, 31 Aug 2020 13:54:08 +0200] rev 2706
Attempt to workaround problem reported about empty plc.xml after unrelated crash. Now, if etree model is corrupted in a way tostring() would generate an empty string, exception prevents saving.