get_actions() always needs to return SortedDict, not list

[philomat]

All docs state that get_actions() returns a dict. From documentation of ModelAdmin.get_actions():

        """
        Return a __dictionary__ mapping the names of all actions...
        """

However:

        if self.actions is None or IS_POPUP_VAR in request.GET:
            return [] # list!

This can lead to problems when you extend that method and expect a dict, and treat its return value as such trying to modify its elements. My patch returns an empty SortedDict.

[Alex Gaynor]

In [15393]:

Fixed #15212 -- ensure that ModelAdmin.get_actions still returns a SortedDict if there are no actions.

[Alex Gaynor]

In [15394]:

[1.2.X] Fixed #15212 -- ensure that ModelAdmin.get_actions still returns a SortedDict if there are no actions. Backport of [15393].