[sd-2453-1] (error handling)-undo/redo fix for medium editor
[sd-2453-1] (error handling)-undo/redo fix for medium editor

mdhaman/superdesk-aap,superdesk/superdesk,petrjasek/superdesk,petrjasek/superdesk-ntb,Aca-jov/superdesk,superdesk/superdesk,marwoodandrew/superdesk,fritzSF/superdesk,akintolga/superdesk-aap,Aca-jov/superdesk,amagdas/superdesk,pavlovicnemanja/superdesk,verifiedpixel/superdesk,marwoodandrew/superdesk,mugurrus/superdesk,superdesk/superdesk-aap,superdesk/superdesk-aap,akintolga/superdesk-aap,petrjasek/superdesk,liveblog/superdesk,mdhaman/superdesk-aap,verifiedpixel/superdesk,verifiedpixel/superdesk,marwoodandrew/superdesk,gbbr/superdesk,ancafarcas/superdesk,petrjasek/superdesk-ntb,akintolga/superdesk,Aca-jov/superdesk,petrjasek/superdesk-ntb,hlmnrmr/superdesk,plamut/superdesk,plamut/superdesk,mdhaman/superdesk-aap,thnkloud9/superdesk,ioanpocol/superdesk,ancafarcas/superdesk,liveblog/superdesk,akintolga/superdesk-aap,superdesk/superdesk-ntb,pavlovicnemanja/superdesk,darconny/superdesk,akintolga/superdesk,sjunaid/superdesk,amagdas/superdesk,amagdas/superdesk,ioanpocol/superdesk-ntb,gbbr/superdesk,superdesk/superdesk,mdhaman/superdesk,pavlovicnemanja92/superdesk,superdesk/superdesk,pavlovicnemanja92/superdesk,gbbr/superdesk,superdesk/superdesk-aap,fritzSF/superdesk,akintolga/superdesk,amagdas/superdesk,sivakuna-aap/superdesk,superdesk/superdesk-ntb,akintolga/superdesk,plamut/superdesk,marwoodandrew/superdesk,liveblog/superdesk,sjunaid/superdesk,verifiedpixel/superdesk,marwoodandrew/superdesk-aap,superdesk/superdesk-ntb,fritzSF/superdesk,mugurrus/superdesk,akintolga/superdesk-aap,thnkloud9/superdesk,mdhaman/superdesk-aap,marwoodandrew/superdesk-aap,mdhaman/superdesk,superdesk/superdesk-ntb,petrjasek/superdesk,plamut/superdesk,sivakuna-aap/superdesk,sivakuna-aap/superdesk,pavlovicnemanja92/superdesk,ioanpocol/superdesk,ancafarcas/superdesk,hlmnrmr/superdesk,marwoodandrew/superdesk-aap,darconny/superdesk,fritzSF/superdesk,plamut/superdesk,sivakuna-aap/superdesk,marwoodandrew/superdesk,fritzSF/superdesk,pavlovicnemanja/superdesk,amagdas/superdesk,hlmnrmr/superdesk,pavlovicnemanja/superdesk,ioanpocol/superdesk,marwoodandrew/superdesk-aap,liveblog/superdesk,ioanpocol/superdesk-ntb,ioanpocol/superdesk-ntb,sjunaid/superdesk,darconny/superdesk,petrjasek/superdesk-ntb,liveblog/superdesk,sivakuna-aap/superdesk,pavlovicnemanja92/superdesk,pavlovicnemanja92/superdesk,thnkloud9/superdesk,superdesk/superdesk-aap,mdhaman/superdesk,akintolga/superdesk,verifiedpixel/superdesk,mugurrus/superdesk,petrjasek/superdesk