Fixed error when running manage.py collectstatic. Fixed #2861.

.gitignore

@@ -15,6 +15,7 @@ bower_components/*
 # Local user data (settings, database, media, search index, static files)
 personal_data/*
 openslides/static/*
+collected-static/*
 
 # Package building/IDE
 docs/_build/*

openslides/utils/main.py

@@ -253,6 +253,8 @@ def write_settings(settings_path=None, template=None, **context):
         os.makedirs(settings_module)
     with open(settings_path, 'w') as settings_file:
         settings_file.write(content)
+    openslides_user_data_path = context['openslides_user_data_path'].strip("'")
+    os.makedirs(os.path.join(openslides_user_data_path, 'static'), exist_ok=True)
     return os.path.realpath(settings_path)