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ggplot (or grob) object must be printed when print_plot is TRUE
https://github.com/rsquaredacademy/olsrr/issues/158#issuecomment-623319168
Brief description of the problem:
The print_plot parameter in plot must print the graphical output of the ggplot (or grob) object when set to TRUE.
The graphical object can be returned invisibly by the function.