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NoneType on filter get - deleting filter twice

See original GitHub issue

Cater for the case of deleting last filter for an institute / same filter twice?

2020-09-01 14:01:23,660 - scout.server.app - ERROR: Exception on /cust002/F0035385/variants [POST] [in /home/hiseq.clinical/miniconda/envs/prod/lib/python3.6/site-packages/flask/app.py:1892]
Traceback (most recent call last):
 File "/home/hiseq.clinical/miniconda/envs/prod/lib/python3.6/site-packages/flask/app.py", line 2447, in wsgi_app
   response = self.full_dispatch_request()
 File "/home/hiseq.clinical/miniconda/envs/prod/lib/python3.6/site-packages/flask/app.py", line 1952, in full_dispatch_request
   rv = self.handle_user_exception(e)
 File "/home/hiseq.clinical/miniconda/envs/prod/lib/python3.6/site-packages/flask/app.py", line 1821, in handle_user_exception
   reraise(exc_type, exc_value, tb)
 File "/home/hiseq.clinical/miniconda/envs/prod/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
   raise value
 File "/home/hiseq.clinical/miniconda/envs/prod/lib/python3.6/site-packages/flask/app.py", line 1950, in full_dispatch_request
   rv = self.dispatch_request()
 File "/home/hiseq.clinical/miniconda/envs/prod/lib/python3.6/site-packages/flask/app.py", line 1936, in dispatch_request
   return self.view_functions[rule.endpoint](**req.view_args)
 File "/home/hiseq.clinical/SERVER/apps/scout/git/scout/scout/server/utils.py", line 23, in decorated_function
   context = func(*args, **kwargs)
 File "/home/hiseq.clinical/SERVER/apps/scout/git/scout/scout/server/blueprints/variants/views.py", line 57, in variants
   store, institute_obj, case_obj, user_obj, category, request.form
 File "/home/hiseq.clinical/SERVER/apps/scout/git/scout/scout/server/blueprints/variants/controllers.py", line 621, in populate_filters_form
   filter_obj = store.delete_filter(filter_id, institute_id, current_user.email)
 File "/home/hiseq.clinical/SERVER/apps/scout/git/scout/scout/adapter/mongo/filter.py", line 122, in delete_filter
   user_id, filter_obj.get("display_name"), institute_id
AttributeError: 'NoneType' object has no attribute 'get'