feat(task): if task desc is invalid do not update to avoid empty values
feat(task): if task desc is invalid do not update to avoid empty values

rolandjitsu/angular-lab,marc-inn/ng2-play,marc-inn/ng2-play,rolandjitsu/ng2-play,btford/ng2-play,rolandjitsu/ng2-play,marc-inn/ng2-play,rolandjitsu/ng2-lab,btford/ng2-play,btford/ng2-play,rolandjitsu/angular-lab,rolandjitsu/ng2-lab,rolandjitsu/angular-lab,btford/ng2-play,rolandjitsu/ng2-lab,rolandjitsu/ng2-lab,rolandjitsu/ng2-play,rolandjitsu/ng2-play,marc-inn/ng2-play,rolandjitsu/angular-lab