Import fails when picture choice questions have empty/missing image data #3070
Description
Reproduction Steps
- Create a course with a quiz containing a picture_choice question
- Add image-type choices but leave the image data empty or remove the images before export
- Export the course as JSON
- Attempt to import the JSON file on another site
Expected Behavior
Course import succeeds and inserts empty picture choice question
Actual Behavior
Fatal error
Error Messages / Logs
PHP Fatal error: Uncaught TypeError: Cannot access offset of type string on string in
/wp-content/plugins/lifterlms/includes/class-llms-generator-courses.php:632
Stack trace:
#0 class-llms-generator-courses.php(454): LLMS_Generator_Courses->maybe_sideload_choice_image()
#1 class-llms-generator-courses.php(384): LLMS_Generator_Courses->create_question()
#2 class-llms-generator-courses.php(333): LLMS_Generator_Courses->create_quiz()
#3 class-llms-generator-courses.php(522): LLMS_Generator_Courses->create_lesson()
#4 class-llms-generator-courses.php(269): LLMS_Generator_Courses->create_section()
#5 class-llms-generator-courses.php(163): LLMS_Generator_Courses->create_course()
#6 class-llms-generator-courses.php(132): LLMS_Generator_Courses->generate_courses()
#7 class.llms.generator.php(138): LLMS_Generator_Courses->generate_course()
#8 class.llms.admin.import.php(228): LLMS_Generator->generate()
#9 class.llms.admin.import.php(300): LLMS_Admin_Import->handle_generation()
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