numerous HASH-named category names and descriptions on gmoc-db

[chaos@bbn.com]

The category table at ​https://gmoc-db.grnoc.iu.edu/measurement/services/snapp.cgi?method=get_categories_by_parent;parent_id=5 contains a large number of malformed entries which look like:

{"category_id":"202852","name":"HASH(0x2aaaac25fa10)","description":"HASH(0x2aaaac25fa10)"},{"category_id":"205570","name":"HASH(0x2aaaac28d200)","description":"HASH(0x2aaaac28d200)"},

Figure out where these entries are coming from, fix the submitter to do the right thing, and get rid of them.

[chaos@bbn.com]

Mitch thinks this is being caused by the node_info block submitted by measurement data from gmoc.py, which contains an empty:

  <tags/>

element, and the server-side parser handles that by returning an empty hash instead of an empty array, leading to shenanigans.

• gmoc.py might as well not submit an empty tags element in node_info. We could remove that.
• Mitch will try a fix on the server-side to ignore a category when the empty hash is returned by the parser, rather than try to insert it.