Steps to reproduce:

1) new install then log in as admin user
2) Go to create -> files and create a folder called "Animals"
3) go into this folder and create a folder called "Cats"
4) go into that folder and add some images of cats (find some in the Internet)
5) Go to create -> pages and collections and create a page called "Test outcome"
6) Edit the page and add:
- a 'folder' block to the page and select the folder "Cats" to display
- an 'image' block to the page and select one of the images in the "cats" folder
7) Go to create -> Plans and create a plan called 'Test outcome plan' and have 
'Template' and 'Assignment tasks' turned on (set to 'Yes')
8) Create a task called "Test outcome plan task" and under 'Assign portfolio' 
choose the page you created in step 5
9) Create a group called "Test group"
10) Choose 'Plans' in group's menu bar and click 'new plan'
11) Click the 'From template' button and choose the plan created in step 7 and 
save
12) You should see a page with title:  Plan 'Test outcome plan' tasks | Test 
group 
13) Delete the task - see the error

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https://bugs.launchpad.net/bugs/1850559

Title:
  Problem with deleting a plan task

Status in Mahara:
  In Progress
Status in Mahara 19.10 series:
  Confirmed
Status in Mahara 20.04 series:
  In Progress

Bug description:
  Error message when I wanted to delete a group plan that had 1 task

  [WAR] 98 (artefact/plans/tools/PlansTools.php:691) Trying to get property 
'plugin' of non-object
  Call stack (most recent first):

      log_message("Trying to get property 'plugin' of non-object", 8, true, 
true, "/home/kristina/code/1910stable/htdocs/artefact/pla...", 691) at 
/home/kristina/code/1910stable/htdocs/lib/errors.php:521
      error(8, "Trying to get property 'plugin' of non-object", 
"/home/kristina/code/1910stable/htdocs/artefact/pla...", 691, array(size 8)) at 
/home/kristina/code/1910stable/htdocs/artefact/plans/tools/PlansTools.php:691
      
artefact\plans\tools\PlansTools::deleteViewAndAssignedArtefacts(object(View)) 
at /home/kristina/code/1910stable/htdocs/artefact/plans/lib.php:1009
      ArtefactTypeTask->delete() at 
/home/kristina/code/1910stable/htdocs/artefact/lib.php:722
      ArtefactType->delete() at 
/home/kristina/code/1910stable/htdocs/artefact/plans/lib.php:319
      ArtefactTypePlan->delete() at 
/home/kristina/code/1910stable/htdocs/artefact/plans/plan/delete.php:94
      deleteplanform_submit(object(Pieform), array(size 2)) at 
/home/kristina/code/1910stable/htdocs/lib/pieforms/pieform.php:546
      Pieform->__construct(array(size 6)) at 
/home/kristina/code/1910stable/htdocs/lib/pieforms/pieform.php:168
      Pieform::process(array(size 6)) at 
/home/kristina/code/1910stable/htdocs/lib/mahara.php:5432
      pieform(array(size 6)) at 
/home/kristina/code/1910stable/htdocs/artefact/plans/plan/delete.php:80

  [WAR] 98 (artefact/plans/tools/PlansTools.php:692) Trying to get property 
'artefacttype' of non-object
  Call stack (most recent first):

      log_message("Trying to get property 'artefacttype' of non-objec...", 8, 
true, true, "/home/kristina/code/1910stable/htdocs/artefact/pla...", 692) at 
/home/kristina/code/1910stable/htdocs/lib/errors.php:521
      error(8, "Trying to get property 'artefacttype' of non-objec...", 
"/home/kristina/code/1910stable/htdocs/artefact/pla...", 692, array(size 8)) at 
/home/kristina/code/1910stable/htdocs/artefact/plans/tools/PlansTools.php:692
      
artefact\plans\tools\PlansTools::deleteViewAndAssignedArtefacts(object(View)) 
at /home/kristina/code/1910stable/htdocs/artefact/plans/lib.php:1009
      ArtefactTypeTask->delete() at 
/home/kristina/code/1910stable/htdocs/artefact/lib.php:722
      ArtefactType->delete() at 
/home/kristina/code/1910stable/htdocs/artefact/plans/lib.php:319
      ArtefactTypePlan->delete() at 
/home/kristina/code/1910stable/htdocs/artefact/plans/plan/delete.php:94
      deleteplanform_submit(object(Pieform), array(size 2)) at 
/home/kristina/code/1910stable/htdocs/lib/pieforms/pieform.php:546
      Pieform->__construct(array(size 6)) at 
/home/kristina/code/1910stable/htdocs/lib/pieforms/pieform.php:168
      Pieform::process(array(size 6)) at 
/home/kristina/code/1910stable/htdocs/lib/mahara.php:5432
      pieform(array(size 6)) at 
/home/kristina/code/1910stable/htdocs/artefact/plans/plan/delete.php:80

  [WAR] 98 (lib/errors.php:536) [Error]: Cannot instantiate abstract class 
ArtefactType
  Call stack (most recent first):

      exception(object(Error)) at Unknown:0

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