Allow parsing of error yaml files without metadata yaml file
Allow parsing of error yaml files without metadata yaml file

At present parser throws error if metadata yaml file is not found,
modified to not to return error.

Restruture the code to loop through the entries in the error
yaml file rather than through the meta yaml file.

Change-Id: Iaae61690201aeffd8d9caa41515b29b7cc0b59a2
Signed-off-by: Marri Devender Rao <0a3dc38878bb7754216ba1e690ff81eb9075b092@in.ibm.com>

openbmc/phosphor-logging,openbmc/phosphor-logging,openbmc/phosphor-logging,openbmc/phosphor-logging