Fixed: NULL dereference when the first line given on input is empty.
Thanks to Sergey Revyako for bug report!
paexec: one more regression test for empty line on input
Fix for babfce8
'paexec -g' accepts empty strings as tasks. More regression tests.
"paexec -x" now works correctly together with -t.
Thanks to Sergey Revyako for bug report.