Replace NULL with NA in interviews_plotting

[jessesadler]

Closes #528

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/datacarpentry/r-socialsci/compare/md-outputs..md-outputs-PR-529

The following changes were observed in the rendered markdown documents:

 05-ggplot2.md                                      |   2 +-
 data/download_data.R                               |   4 ++
 data/interviews_plotting.csv                       |  80 ++++++++++-----------
 fig/05-ggplot2-rendered-adding-colors-1.png        | Bin 17722 -> 17494 bytes
 fig/05-ggplot2-rendered-adding-jitter-1.png        | Bin 8774 -> 9113 bytes
 fig/05-ggplot2-rendered-adding-width-height-1.png  | Bin 8862 -> 9233 bytes
 fig/05-ggplot2-rendered-boxplot-exercise-1.png     | Bin 10252 -> 10148 bytes
 ...-ggplot2-rendered-boxplot-exercise-factor-1.png | Bin 21106 -> 21247 bytes
 fig/05-ggplot2-rendered-boxplot-with-jitter-1.png  | Bin 16533 -> 16666 bytes
 fig/05-ggplot2-rendered-color-by-species-1.png     | Bin 19374 -> 19641 bytes
 fig/05-ggplot2-rendered-scatter-challenge-1.png    | Bin 19109 -> 18957 bytes
 fig/05-ggplot2-rendered-violin-plot-1.png          | Bin 28159 -> 28222 bytes
 md5sum.txt                                         |   2 +-
 13 files changed, 46 insertions(+), 42 deletions(-)

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⏱️ Updated at 2024-09-27 18:29:10 +0000