fix(service-account): add nil pointer checks for cmd outputs#635

rubenhoenle merged 1 commit intomainstackitcloud/stackit-cli:mainfrom

fix/add-nil-pointer-checks-in-service-account-commands-and-add-testsstackitcloud/stackit-cli:fix/add-nil-pointer-checks-in-service-account-commands-and-add-testsCopy head branch name to clipboard