Print the final config after testSynclet runs

A lot of the time, this last state has a useful and important difference from
the paging states, so this output is nice.
Print total entries fetched by testSynclet

Just handy to have at the end there for basic consistency checking.
Don't crash testSynclet when nothing's returned

Synclets don't really have to return anything at all, but `testSynclet` would
bail looking for `data.config`. Now it's forgiving.
Merge branch 'improve-testSynclet'

* improve-testSynclet:
  Don't crash testSynclet when nothing's returned
  Print total entries fetched by testSynclet
  Print the final config after testSynclet runs