remove bad data added to export

[jay-oswald]

The issue comes from the header function correctly using $showgroups which checks both the showgroups config setting, but also checks the course groupmode. However the data function previously

The inconsistency in the header and data functions causes the issue. I have passed in $showgroups to the generating fucntions to make it consistent with the header, there should be no more edge cases now as it all simply uses $showgroups. If if is false there can not be a header or data, and if its true there will always be a header and data.

It was added in #15 and fixes #20

I also removed the $row variable being used on line 121 of rubic.php, it is not used anywhere, and now makes it consistant with guide and btec files.

[marcusgreen]

Hi Jay, what does the bad data looks like without this fix. Part of the reason I ask is that I don't actively maintain this plugin (though will accept nice pulls of course), and I now maintain one that covers similar ground https://github.com/marcusgreen/moodle-report_advancedgrading (See issues for an odd recurring thing that might be a bug...)

[jay-oswald]

The same as in that linked issue, it basically causes an off by 1 error, where the header decides it should not output, but each row decides that it should output.

So the group string ends up getting output in the 1st column of the score data, which shifts the score data all over by 1 column, and also drops off the last column, which from memory is grading time.

I haven't dug deeply into why it happens, but it's happening at the moment on a site, and making the if statements in the header and data functions the same will eliminate the chance of whatever edge case its happening in.

[marcusgreen]

sorry I didn't read your linked issues