Edit Filters page is broken

[ewels]

The edit_filters/ page triggers an error:

127.0.0.1 - - [12/May/2018 07:52:19] "GET /edit_filters/ HTTP/1.1" 500 -
Error on request:
Traceback (most recent call last):
  File "/Users/ewels/miniconda2/envs/work/lib/python2.7/site-packages/Werkzeug-0.12.2-py2.7.egg/werkzeug/serving.py", line 209, in run_wsgi
    execute(self.server.app)
  File "/Users/ewels/miniconda2/envs/work/lib/python2.7/site-packages/Werkzeug-0.12.2-py2.7.egg/werkzeug/serving.py", line 197, in execute
    application_iter = app(environ, start_response)
  File "/Users/ewels/miniconda2/envs/work/lib/python2.7/site-packages/Flask-0.12-py2.7.egg/flask/app.py", line 1994, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Users/ewels/miniconda2/envs/work/lib/python2.7/site-packages/Flask-0.12-py2.7.egg/flask/app.py", line 1985, in wsgi_app
    response = self.handle_exception(e)
  File "/Users/ewels/miniconda2/envs/work/lib/python2.7/site-packages/Flask-0.12-py2.7.egg/flask/app.py", line 1540, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/ewels/miniconda2/envs/work/lib/python2.7/site-packages/Flask-0.12-py2.7.egg/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/ewels/miniconda2/envs/work/lib/python2.7/site-packages/Flask-0.12-py2.7.egg/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Users/ewels/miniconda2/envs/work/lib/python2.7/site-packages/Flask-0.12-py2.7.egg/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/ewels/miniconda2/envs/work/lib/python2.7/site-packages/Flask-0.12-py2.7.egg/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Users/ewels/miniconda2/envs/work/lib/python2.7/site-packages/Flask_DebugToolbar-0.10.1-py2.7.egg/flask_debugtoolbar/__init__.py", line 125, in dispatch_request
    return view_func(**req.view_args)
  File "/Users/ewels/miniconda2/envs/work/lib/python2.7/site-packages/Flask_Login-0.4.0-py2.7.egg/flask_login/utils.py", line 228, in decorated_view
    return func(*args, **kwargs)
  File "/Users/ewels/GitHub/MegaQC/megaqc/public/views.py", line 132, in edit_filters
    sample_filter_counts[sf['id']] = get_samples(filters=sf['id'], count=True)
  File "/Users/ewels/GitHub/MegaQC/megaqc/api/utils.py", line 520, in get_samples
    sample_query = build_filter(sample_query, filters, Sample)
  File "/Users/ewels/GitHub/MegaQC/megaqc/api/utils.py", line 621, in build_filter
    for filter_group in filters:
TypeError: 'int' object is not iterable