Minor bug fix.

protogeni/lib/GeniCredential.pm.in

@@ -1029,7 +1029,7 @@ sub HasActualPrivilege($$)
     my ($self, $p) = @_;
 
     return 0
-	if (!exists($self->{'capabilities'}));
+	if (!defined($self->{'capabilities'}));
 
     return exists($self->{'capabilities'}->{$p}) ? 1 : 0;
 }