fix bug in publishers adding duplicate activities
fix bug in publishers adding duplicate activities

tokatikato/OIPA,VincentVW/OIPA,catalpainternational/OIPA,VincentVW/OIPA,tokatikato/OIPA,bryanph/OIPA,openaid-IATI/OIPA,bryanph/OIPA,bryanph/OIPA,catalpainternational/OIPA,zimmerman-zimmerman/OIPA,tokatikato/OIPA,tokatikato/OIPA,bryanph/OIPA,VincentVW/OIPA,VincentVW/OIPA,catalpainternational/OIPA,zimmerman-zimmerman/OIPA,openaid-IATI/OIPA,zimmerman-zimmerman/OIPA,catalpainternational/OIPA,zimmerman-zimmerman/OIPA,zimmerman-zimmerman/OIPA,openaid-IATI/OIPA,openaid-IATI/OIPA,openaid-IATI/OIPA