Exporting filter conditions with "subject" not working correctly

[RealRaven2000]

When filter conditions which deal with subject (nsMsgSearchAttrib.attribute=0) are not exported correctly during backup. This will lead to the condition having a "disabled" subject attribute in the editor after importing them:

This needs to be fixed when saving (attrib member is missing) and can also be fixed on import by adding the missing attribute value if nsMsgSearchAttrib.value.attrib == 0

[RealRaven2000]

Fixed in version 2.0 / released 13/12/2019