add an explicit error message in case of YML parsing error.
Error in YAML parsing:
----------------
class: SAD
name: sadam
counters:
-counter_name: sc1
channel: 1
-counter_name: sc2
channel: 2
----------------
mapping values are not allowed here
in "pcsht/sim_acq_dev.yml", line 5, column 11:
channel: 1
^
Hint: You can check your configuration with an on-line YAML validator like http://www.yamllint.com/
instead of :
ruamel.yaml.scanner.ScannerError: mapping values are not allowed here
in "pcsht/sim_acq_dev.yml", line 5, column 11:
channel: 1