OPAL-1911: Created installation/upgrade steps for general config
Exception when databases are empty
OPAL-1911: Upgrade/install step for opal general config
OPAL-1910: Setting default values for general config when empty
Merge pull request #262 from emorency/feature/OPAL-1910-System-config

OPAL-1910: Completed installation/upgrade steps for general config
OPAL-1911: Removed general config from default opal-config.properties