`getValues` with `allowSens=True` does not work without specifying `names`.

Description

History.getValues() does not work when we call it with allowSens=True and default values for the other inputs.
To make it work, users have to specify appropriate callCounters and names.
The docstrings say it is up to the user to ensure that the callCounters specified contain the information requested, so this behavior is expected, but not very user-friendly.

Steps to reproduce issue

1. Run one of the test problems.
2. Read the history file and call hist.getValues(allowSense=True).

Current behavior

It tries to parse obj/con/funcs from the sensitivity evaluation, even though we don't have that info. Then it fails with KeyError.

Expected behavior

It should raise a pyOptSparse Warning or Error when allowSens=True and the (default or user-specified) callCounters and names are not valid.
It'd be better if we can overwrite callCounters and names internally.

Start with History.getValues and trace how allowSens uses the default or supplied callCounters and names when reading a history file. Reproduce the failure with one of the test problems and hist.getValues(allowSens=True); done means invalid sensitivity requests produce the specified pyOptSparse warning or error instead of a KeyError.