Update Discussion - Tags field is not saved

[cakyel]

When Tags field is filled in Update Discussion page, it is not saved. It must be saved.

1)

http://162.243.215.160/Content/#/update_discussion

2)

http://162.243.215.160/Content/#/discussion_detail

3)

http://162.243.215.160/Content/#/update_discussion

[cakyel]

Test Cases

GIVEN there is an existing discussion in an existing group and the user is in Update Discussion page, WHEN Tags field is filled and Update Discussion button is clicked, THEN the value in the field is saved and it is listed in discussion details page.

• [ ] Discussion can be updated
• [ ] Tags field is updated in the discussion
• [ ] Values of Tags field is listed in discussion details page

[cakyel]

This is duplicate with the following issue so I am closing it:

https://github.com/swe574-2015fall-group2/webapp_repo/issues/93