Cannot add environments to Usage Profile

[weibullguy]

Describe the bug
Environments cannot be added to a Usage Profile. Attempting to add an environment raises a KeyError exception.

Expected Behavior
As a RAMSTK analyst, I want to be able to add environmental conditions so that I can build a complete Usage Profile.

Actual Behavior
Environments cannot be added.

Reproduce

1. Launch RAMSTK
2. Open a Program database
3. Select the Usage Profile tab in the Revision work book
4. Select an existing environment
5. Press the 'Add Sibling' button

Logs
Printed to the terminal:

Traceback (most recent call last):
  File "/home/drowland/.venvs/ramstk-hh6iB4_W-py3.8/lib/python3.8/site-packages/ramstk/views/gtk3/usage_profile/view.py", line 180, in _do_request_insert_sibling
    pub.sendMessage(
  File "/home/drowland/.venvs/ramstk-hh6iB4_W-py3.8/lib/python3.8/site-packages/pubsub/core/publisher.py", line 216, in sendMessage
    topicObj.publish(**msgData)
  File "/home/drowland/.venvs/ramstk-hh6iB4_W-py3.8/lib/python3.8/site-packages/pubsub/core/topicobj.py", line 452, in publish
    self.__sendMessage(msgData, topicObj, msgDataSubset)
  File "/home/drowland/.venvs/ramstk-hh6iB4_W-py3.8/lib/python3.8/site-packages/pubsub/core/topicobj.py", line 482, in __sendMessage
    listener(data, self, allData)
  File "/home/drowland/.venvs/ramstk-hh6iB4_W-py3.8/lib/python3.8/site-packages/pubsub/core/listener.py", line 237, in __call__
    cb(**kwargs)
  File "/home/drowland/.venvs/ramstk-hh6iB4_W-py3.8/lib/python3.8/site-packages/ramstk/models/basemodel.py", line 249, in do_insert
    _record = self.do_get_new_record(attributes)
  File "/home/drowland/.venvs/ramstk-hh6iB4_W-py3.8/lib/python3.8/site-packages/ramstk/models/programdb/environment/table.py", line 74, in do_get_new_record
    _new_record.mission_id = attributes["mission_id"]
KeyError: 'mission_id'

Additional Comments
None

dobranch
priority: blocker
type: fix