edit_annotation view fixing#01
edit_annotation view fixing#01

Previous annotation documents did not include a creator field therefore
nickname cannot be retrieved and comparison to current logged-in user
nickname throws (was throwing) an Error. Now checking for validity of
annotation creator nickname before processing.

EUDAT-B2NOTE/b2note,EUDAT-B2NOTE/b2note,EUDAT-B2NOTE/b2note,EUDAT-B2NOTE/b2note,EUDAT-B2NOTE/b2note