(Tested on Ibexa Experience v3.3.27)

• create file my_dir/MY_TEST in project directory
• run php bin/console  ibexa:migrations:kaliop:bulk-convert my_dir

Result:

In BulkConvertCommand.php line 340:
     Notice: Undefined  index: extension
 

Expected:
Command should run without errors and ignore files that do not have one of the file extensions yaml or yml.