Added robustness for other missing JSON files

[jfthuong]

This could be improved even further with a while loop that adds dummy required, like described in #4

[m-schubert]

There's a bigger issue with this PR - the generated _endpoints.py contains duplicate class definitions:

...

class Tags(Endpoint):
    def update(self, **kwargs):
        return self.client.request('/tags/{id}', 'PUT', argument_type=argument_types.TagsUpdateArgument, return_type=return_types.Tag, **kwargs)

...

class Tags(Endpoint):
    def __init__(self, client):
        super().__init__(client)
        self.sums = TagsSums(client)

    def merge(self, **kwargs):
        return self.client.request('/tags/merge', 'POST', argument_type=argument_types.TagsMergeArgument, **kwargs)

    def list(self, **kwargs):
        return self.client.request('/tags', 'GET', argument_type=argument_types.TagsListArgument, return_type=return_types.Tag, **kwargs)

    def get(self, **kwargs):
        return self.client.request('/tags/{id}', 'GET', argument_type=argument_types.TagsGetArgument, return_type=return_types.Tag, **kwargs)

    def delete(self, **kwargs):
        return self.client.request('/tags/{id}', 'DELETE', argument_type=argument_types.TagsDeleteArgument, **kwargs)

    def create(self, **kwargs):
        return self.client.request('/tags', 'POST', argument_type=argument_types.TagsCreateArgument, **kwargs)

class Me(Endpoint):
    def update(self, **kwargs):
        return self.client.request('/me', 'PUT', argument_type=argument_types.MeUpdateArgument, return_type=return_types.User, **kwargs)

    def settings(self, **kwargs):
        return self.client.request('/me/settings', 'GET', **kwargs)

    def revert(self, **kwargs):
        return self.client.request('/me/revert', 'POST', argument_type=argument_types.MeRevertArgument, **kwargs)

    def push(self, **kwargs):
        return self.client.request('/me/push', 'POST', argument_type=argument_types.MePushArgument, **kwargs)

...

class Me(Endpoint):
    def __init__(self, client):
        super().__init__(client)
        self.notifications = MeNotifications(client)

    def get(self, **kwargs):
        return self.client.request('/me', 'GET', return_type=return_types.User, **kwargs)

    def devices(self, **kwargs):
        return self.client.request('/me/devices', 'GET', **kwargs)

...

I haven't looked into why, exactly, but perhaps you could take a look? Alternatively, I'm happy to cherry pick contributions from this PR to merge?

[jfthuong]

There's a bigger issue with this PR - the generated _endpoints.py contains duplicate class definitions:

I know, I have noticed it in my later commits. I have later totally re-written that part to make it simpler.

It is, in our case, related to the sorted(..., reverse=True) line. I have corrected and pushed. (commit 0777da9)