Um, '+' means at least one (and you don't need the box):
! /^\s*$/
Anyway, it's even easier just to check for a non-space:
/\S/
But, as long as we're at it, why not accept only well-formed lines:
if ( /^(\w+)\s+([\d.]+)/ ) {
($names[$l],$versions[$l])=($1,$2);
++$l;
else { . . .
  p
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