DEF reader issue: VIARULE without PATTERN does not provide vias

[klayoutmatthias]

This is related to the forum entry here: https://www.klayout.de/forum/discussion/1454/support-for-viarule-lef-def-constructs#latest

The DEF testcase is:

VERSION 5.6 ;
NAMESCASESENSITIVE ON ;
DIVIDERCHAR "/" ;
BUSBITCHARS "<>" ;
DESIGN SMALL ;
UNITS DISTANCE MICRONS 100 ;

DIEAREA ( -30 -30 ) ( 1030 1030 ) ;

VIAS 1 ;
- via1_960x340
+ VIARULE Via1Array-0
  + CUTSIZE 140 140
  + LAYERS metal1 via1 metal2 
  + CUTSPACING 160 160
  + ENCLOSURE 110 100 110 100
  + ROWCOL 1 3
;
END VIAS

SPECIALNETS 1 ;
- VDD ( * VDD )
+ ROUTED metal1 0 + SHAPE STRIPE ( 500 500 ) via1_960x340
+ USE POWER ;
END SPECIALNETS

END DESIGN