ECS Instance exception in version 1.5.0

[ben-denham]

Hi there, thanks very much for this useful Ansible provider for Alicloud.

I believe I may have found a bug introduced in ed325de.

When using the ali_instance module of https://github.com/alibaba/ansible-provider version 1.5.0, I receive a TypeError: string indices must be integers, not str for the following line (https://github.com/alibaba/footmark/blob/master/footmark/ecs/instance.py#L249):

if value and value["ip_address"]:

It seems that value is a string rather than a dictionary-like object? In case it is relevant, I have the assign_public_ip parameter of ali_instance set to True.

[xuchen81]

getting the same issue, can someone look into this?? @xiaozhu36