code: private JsonSimpleConfig deCacheConfig(String oid) {
  		if (useCache && configCache.containsKey(oid)) {
  			return configCache.get(oid);
  		}
  		return null;
  	}
docs: Return a config class from the cache if configured
  
  @param oid
  : The config OID to retrieve if cached
  @return JsonConfigHelper : The cached config, null if not found