cptMetrics - Earned Schedule - fill gaps in week_ending

[AronGahagan]

Problem:

If there is neither BCWS nor ETC in a given week, the week does not appear, tripping a formula error.

Solution:

fill the gaps.

Todo:

• [x] assign this issue
• [x] label the issue for enhancement or bug
• [x] label the issue with codemodule (so fixes can be aggregated and hotfixed together)
• [x] checkout appropriate branch and create topic branch
• [x] design, code and test
• [x] update codemodule x.y.z
• [x] update CurrentVersions.xml manually
• [x] commit changes prefix comment with Issue #XXX -
• [x] merge topic into appropriate branch(es) and push
• [x] delete topic branch