In case eAthena r15263 will be merged and the community has use for it, there's an excess add-on code, that has not and will not be committed to eAthena, due to it's nature of being a custom.
The patch allows to optionally reject completely transparent emblems as part of the emblem validation code. Transparent emblems are typically abused during WoE times to draw less attention in castles and were/are considered against the rules on some official and private RO servers.
Commented lines are an alternative approach for same effect, and may be removed.
patch