Default dashboard joined_date to None
Default dashboard joined_date to None

ccqi/rmc,MichalKononenko/rmc,JGulbronson/rmc,UWFlow/rmc,ccqi/rmc,shakilkanji/rmc,rageandqq/rmc,duaayousif/rmc,MichalKononenko/rmc,UWFlow/rmc,ccqi/rmc,rageandqq/rmc,UWFlow/rmc,rageandqq/rmc,duaayousif/rmc,duaayousif/rmc,rageandqq/rmc,MichalKononenko/rmc,sachdevs/rmc,duaayousif/rmc,ccqi/rmc,MichalKononenko/rmc,JGulbronson/rmc,JGulbronson/rmc,shakilkanji/rmc,sachdevs/rmc,JGulbronson/rmc,duaayousif/rmc,shakilkanji/rmc,sachdevs/rmc,sachdevs/rmc,sachdevs/rmc,UWFlow/rmc,rageandqq/rmc,UWFlow/rmc,JGulbronson/rmc,MichalKononenko/rmc,ccqi/rmc,shakilkanji/rmc,shakilkanji/rmc