The best way for Xon's search addon to get a well-formed entity would be to call the content-type search handler's "getContent" method. Depending on what Xon is using it for, filling an existing entity manually may not get the correct result.
In any case, you can create an entity record for the vwcomment type as follows. In AdminCP > Development > Content types, add field:
Content type: vwcomment
Field: entity
Value: vw_DM_Comment_Controller_XF2
Addon: VaultWiki
It will be included in the next release.