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[Mahara Bot <1912705@xxxxxxxxxxxxxxxxxx>]

Patch for "21.04_STABLE" branch: https://reviews.mahara.org/11773

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https://bugs.launchpad.net/bugs/1912705

Title:
  Task "export_process_queue" fails on cron run

Status in Mahara:
  Confirmed
Status in Mahara 20.10 series:
  Confirmed
Status in Mahara 21.04 series:
  Confirmed
Status in Mahara 21.10 series:
  In Progress

Bug description:
  When submissions are set to be archived before being released back to
  the submitter, they are queued for export and an archived version is
  created. This processed failed for us and we were given a hint in the
  cron logs/output that the error was thrown at
  `htdocs/artefact/comment/blocktype/comment/lib.php:111`.

  Adding a `debug_print_backtrace()` to the file reveals more in the cron output:
  ```
  [INF] 35 (lib/cron.php:190) Running core cron export_process_queue
  #0  PluginBlocktypeComment::render_instance_export(BlockInstance Object ([BlockInstanceid] => 320133,[BlockInstanceblocktype] => comment,[BlockInst............[truncated]
      , html) called at [<siteroot>/mahara/htdocs/lib/mahara.php:1818]
  #1  call_static_method(PluginBlocktypeComment, render_instance_export, BlockInstance Object ([BlockInstanceid] => 320133,[BlockInstanceblocktype] => comment,[BlockInst............[truncated]
      , html) called at [<siteroot>/mahara/htdocs/blocktype/lib.php:1351]
  #2  BlockInstance->render_viewing(html, ) called at [<siteroot>/mahara/htdocs/lib/view.php:2290]
  #3  View->build_column(3, 1, , html, ) called at [<siteroot>/mahara/htdocs/lib/view.php:2241]
  #4  View->build_columns(3, , html, ) called at [<siteroot>/mahara/htdocs/lib/view.php:2182]
  #5  View->build_rows(, html) called at [<siteroot>/mahara/htdocs/export/html/lib.php:479]
  #6  PluginExportHtml->dump_view_export_data() called at [<siteroot>/mahara/htdocs/export/html/lib.php:242]
  #7  PluginExportHtml->export() called at [<siteroot>/mahara/htdocs/export/lib.php:1015]
  #8  PluginExportAll->export() called at [<siteroot>/mahara/htdocs/export/lib.php:704]
  #9  export_process_queue() called at [<siteroot>/mahara/htdocs/lib/cron.php:198]
  [WAR] 35 (lib/errors.php:536) [Error]: Call to a member function get() on null at <siteroot>/mahara/htdocs/artefact/comment/blocktype/comment/lib.php:112
  Call stack (most recent first):
    * exception(object(Error)) at Unknown:0
  A nonrecoverable error occurred. This probably means you have encountered a bug in the system
  ```

  We were able to fix it by explicitly declaring `global $exporter;` in
  `htdocs/export/lib.php:602` at the very start of the
  `export_process_queue` function - please refer to attached patch.

  It also affects portfolio exports when the "Export to queue" settings
  is enabled in Configure site > Site options > Account settings.

  
  ------------------------------
  Application/System version(s):
  Mahara
  $config->version = 2020013013;
  $config->series = '20.04';
  $config->release = '20.04.2';

  OS
  Ubuntu 18.04.5 LTS

  DB
  MySQL 5.7
  ------------------------------

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