Request #7656 - Migration DocmanV1 fails when UGROUP_NONE or UGROUP_ANONYMOUS

Problem was coming from the fact that ugroup_db_get_dynamic_members can
in some cases (UGROUP_NONE and UGROUP_ANONYMOUS) return an empty SQL
query. It was not previously catched by the code leading to a fatal
error (particularly on import from DocmanV1). Empty sql query is now
catched and an empty data access result is returned in this case.

Change-Id: I60cb3b69bbdd842348ed46bff9df75a8dbe02c33
request #7669 AD: only one milestone is displayed in past section

Change-Id: I4ddac1ca6ab8a5c9eb59f6db6db7f326281a099f
Tuleap 7.7-4

Change-Id: I707cdbd515a74282486409ce1edc496c1fca0cbc