Add small test case for helper-nipap

It would be nice with a testcase that has more coverage of helper-nipap
before we do any modifications to it.

Part of #280.
Fix test for #280

Don't know what to call this test, but it does properly test the issue
at hand and shows the issue.

Part of #280.
Fix a bug in Command parser lib

Another fix to the Command parser lib. Our unittest is far from full
covering of the Command lib, but my limited testing shows that this does
work correctly.

This fixes #280.
Merge branch '280-helper-nipap-bork'