fix(opensearch): add nil pointer checks for cmd outputs#616

rubenhoenle merged 1 commit intomainstackitcloud/stackit-cli:mainfrom

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