small fix with single link apx files
This fixes the issue to convert a single link apx file to emp Tested with the following pattern:
#myBoard
#WordCnt LINK_00
#BeginData
0x0000 0x00 0x0000000000000000
0x0001 0x0B 0x0000000000000001
0x0002 0x0C 0x0000000000000002
0x0003 0x00 0x0000000000000003
0x0004 0x0A 0x0000000000000004
0x0005 0x0C 0x0000000000000005
0x0006 0x00 0x0000000000000006
0x0007 0x0A 0x0000000000000007
0x0008 0x0C 0x0000000000000008
0x0009 0x00 0x0000000000000009
tested with:
touch test.txt
merge-board-data TESTDATA EMPv2 test.txt