copy terms to global variable blackboard, fix attribute_goals//1

src/prolog/lib/atts.pl

@@ -13,8 +13,10 @@
    of a particular module, as a list of terms of the form
    Module:put_atts(V, ListOfAtts). */
 '$default_attr_list'(Module, V) -->
-    { Module:get_atts(V, Attributes) },
-    '$default_attr_list'(Attributes, Module, V).
+    (  { Module:get_atts(V, Attributes) } ->
+       '$default_attr_list'(Attributes, Module, V)
+    ;  []
+    ).
 
 '$default_attr_list'([PG | PGs], Module, AttrVar) -->
     (  { '$module_of'(Module, PG) } -> [Module:put_atts(AttrVar, PG)]

src/prolog/lib/non_iso.pl

@@ -12,7 +12,9 @@ forall(Generate, Test) :-
 
 %% (non-)backtrackable global variables.
 
-bb_put(Key, Value) :- atom(Key), !, '$store_global_var'(Key, Value).
+bb_put(Key, Value) :- atom(Key),
+		      !,
+		      '$store_global_var'(Key, Value).
 bb_put(Key, _) :- throw(error(type_error(atom, Key), bb_put/2)).
 
 bb_b_put(Key, NewValue) :-