fix skip_empty_rows('skip') and trailing newlines

[bugfood]

When reading line by line, Text::CSV returns an empty row if the input file contains an empty line, even if skip_empty_rows('skip') is in use.

This happens due to the following code (greatly abridged here):

$seenSomething = 0;
LOOP:
    while($self->__get_from_src($ctx, $src)) {
        $seenSomething = 1;
        # (This conditional happens when EOL is reached and
        # skip_empty_row is set).
        if (!defined $c or $ser == 2) {  # EOF
            $waitingForField = 0;
            last LOOP;
        }
    }

if ($waitingForField) {
    if ($seenSomething or !$ctx->{useIO}) {
        return 1;
    }
    $self->SetDiag(2012);
    return;
}

The call to SetDiag is necessary to set the EOF condition (2012 is EOF). Without this, __parse() returns a truthy value, so getline() returns an empty array.

In order to make the SetDiag call happen, we need to:

• No longer unset $waitingForField (after skipping an empty row, we're still waiting).
• Unset $seenSomething (we did see something, but we skipped it).

This fixes:
#64

[bugfood]

I split this up into two commits.

• The first commit fixes the bug I ran into, and includes tests.
• The second commit fixes what I think are other cases of the same bug, but I didn't see where to test them.

[bugfood]

I can see that CI tests failed because of running the tests against Text::CSV_XS 1.51.

Text::CSV_XS 1.53 should work, but that is apparently not yet released, so I don't think this change can be merged until Text::CSV_XS 1.53 is released.

I updated this PR to:

1. Use Text::CSV_XS 1.53 instead of 1.51.
2. Modify whitespace and use test descriptions according to Text::CSV_XS.

Thanks,
Corey

[bugfood]

The build failures are expected until Text::CSV_XS 1.53 is released.

[bugfood]

I removed an extra line I had accidentally left in 67_emptrow.t.

[charsbar]

Thanks.

[bugfood]

Thank you too.