Define 'hours' vector object if hours given as 'all'
Modify comment for code block and add closing brace
Validate and trim value for 'hours' provided as vector
Make correction to index of 'for' loop
Remove 'size' and 'alpha' parameters in call to ggplot
Remove an incorrect call to ggplot
Make call to ggsave when 'map_output_name' is NULL
Make call to ggsave when 'map_output_name' is not NULL