fixing error in admin panel when user no longer exists.
fixing error in admin panel when user no longer exists.

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