FIX: prevent the code from requiring optional settings and/or settings defined in the configuration
FIX: prevent the code from requiring optional settings and/or settings defined in the configuration

FIX: fixed eval of configuration settings for reuse in bash context

FIX: test run is only required if loading data to the DB

FIX: fixed typo in boolean evaluation for the test configuration existence

FIX: test run should be checked only when loading data to the DB and the file exists

FIX: log directory should always be required, since it's needed for the sender/receiver

FIX: improved error message

orpiske/msg-perf-tool,orpiske/msg-perf-tool,orpiske/msg-perf-tool