Non-HighChart plots return an error when trying to export

[robsyme]

Description of bug

When a multiQC report include plots that are not the basic HighChart variety, plot export throws a potentially confusing error:

When a report contains many plots, it is difficult to track down which plot/plots are causing the issue without going through the list one by one.

I have not included a full MultiQC log as this is a front-end javascript problem. I have checked the I have included a full MultiQC log box regardless. Forgive me Phil ❤️

File that triggers the error

5_multiqc_report.html.zip

MultiQC Error log

No response

Before submitting

• I have read the troubleshooting documentation.
• I am using the latest release of MultiQC.
• I have included a full MultiQC log, not truncated.
• I have attached an input file (.zip if necessary) that triggers the error.

[ewels]

The alert here is not really the problem - the custom FastQC heatmap can't be exported. Fix is to not make this a blocker for exporting other plots though. Instead, alert / warn about the problem and keep going..

[ewels]

• FastQC custom heatmap
• Dragen custom heatmap
• Table scatter plots when columns not selected

[ewels]

Is this fixed by #1976 @vladsavelyev ?