don't allow returning empty values from prompt (#3020)
don't allow returning empty values from prompt (#3020)


petrjasek/superdesk-client-core,marwoodandrew/superdesk-client-core,superdesk/superdesk-client-core,pavlovicnemanja/superdesk-client-core,superdesk/superdesk-client-core,pavlovicnemanja/superdesk-client-core,petrjasek/superdesk-client-core,marwoodandrew/superdesk-client-core,petrjasek/superdesk-client-core,pavlovicnemanja/superdesk-client-core,marwoodandrew/superdesk-client-core,superdesk/superdesk-client-core,petrjasek/superdesk-client-core,petrjasek/superdesk-client-core,superdesk/superdesk-client-core,marwoodandrew/superdesk-client-core,pavlovicnemanja/superdesk-client-core,superdesk/superdesk-client-core,pavlovicnemanja/superdesk-client-core,marwoodandrew/superdesk-client-core