ProFormA XML import might fail

[sentry-io]

Sentry Issue: CODEHARBOR-1M

NoMethodError: undefined method `[]' for nil:NilClass (NoMethodError)

      task = import_tasks.find {|task_hash| task_hash[:path] == subfile.with_indifferent_access[:path] }[:task]
                                                                                                        ^^^^^^^
  app/services/proforma_service/proforma_task_from_cached_file.rb:16:in `execute'
    task = import_tasks.find {|task_hash| task_hash[:path] == subfile.with_indifferent_access[:path] }[:task]
  app/services/service_base.rb:5:in `call'
    new(**).execute
  app/controllers/tasks_controller.rb:105:in `import_confirm'
    proforma_task = ProformaService::ProformaTaskFromCachedFile.call(**import_confirm_params.to_hash.symbolize_keys)
  app/controllers/application_controller.rb:104:in `switch_locale'
    I18n.with_locale(locale, &)
  app/controllers/application_controller.rb:92:in `mnemosyne_trace'
    yield
...
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