$title 'test gdxmerge - (at)input.txt with blank lines' (GDXMERG4,SEQ=980)

$onText
Make sure calling gdxmerge with (at)input.txt works even when the textfile contains blank lines.

Contributor: Aileen Homey, March 2025
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$onCheckErrorLevel
$call gamslib -q trnsport
$call gams trnsport lp=cplex gdx=cplex lo=%GAMS.lo%
$call gams trnsport lp=xpress gdx=xpress lo=%GAMS.lo%

$onEcho > merge.txt
cplex.gdx
xpress.gdx

$offEcho

$call gdxmerge @merge.txt > %system.nullfile%
$call rm merge.txt