Fix missing code in docstrings

fixes #1131 - broken action redirect in FileAdmin

Allow to use empty url for AdminIndexView

Tablib export

Little fix of mongoengine usage example

Remove needless line from the docs

It apparently was copy&pasted by mistake from previous example.

Adding block after filter in list view

More Flexible Exports Without Exceptions

simplify 'skip_checks' for #1194

Don't raise exceptions during export on column_formatters with macros when there is a valid column_formatters_export, column_export_exclude_list or column_export_list configuration available

add unit test for a related table's column object

SQLA - allow using column objects in column_list

SQLA - Allow using column objects in form_columns

fixes #1185

fixes #1185 according to coleifer/peewee@50c9c1d with retro compatibility for peewee's model meta fields hack

Fallback to default location if it was not received from external service

If end-user uses adblock or other extension and access to ip-api.com is blocked
map will apper gray it will not be possible to do anything with it.
If that happens we need to set default location and zoom out for better view.