minor fix: dont die when viewing wiki if user_participation has bad time
minor fix: dont die when viewing wiki if user_participation has bad time

adammck/crabgrass,nilclass/echosocial,riseuplabs/crabgrass,riseuplabs/crabgrass,geoiq/digitalgazette,riseuplabs/crabgrass,ajturner/crisiscommons,nilclass/echosocial,riseuplabs/crabgrass,riseuplabs/crabgrass,adammck/crabgrass,geoiq/digitalgazette,ajturner/crisiscommons,geoiq/digitalgazette,riseuplabs/crabgrass,geoiq/digitalgazette,adammck/crabgrass,ajturner/crisiscommons,riseuplabs/crabgrass,adammck/crabgrass,ajturner/crisiscommons,nilclass/echosocial,nilclass/echosocial