allow abstract layers that lack a DBF file
allow abstract layers that lack a DBF file

seanisom/vtp,nakijun/vtp,seanisom/vtp,markraz/vtp,seanisom/vtp,markraz/vtp,nakijun/vtp,markraz/vtp,nakijun/vtp,seanisom/vtp,nakijun/vtp,markraz/vtp,seanisom/vtp,markraz/vtp,nakijun/vtp