fix: fix error when model missing in transform command

internal/authorizationmodel/read-from-input.go

@@ -23,6 +23,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/openfga/cli/internal/clierrors"
 	"github.com/spf13/cobra"
 )
 
@@ -71,17 +72,17 @@ func ReadFromInputFileOrArg(
 
 	switch {
 	case fileName != "":
-		if err = ReadFromFile(fileName, input, format, storeName); err != nil {
-			return err
-		}
+		return ReadFromFile(fileName, input, format, storeName)
 	case len(args) > 0 && args[0] != "-":
 		*input = args[0]
 		// if the input format is set as the default, set it from the file extension (and default to fga)
 		if *format == ModelFormatDefault {
 			*format = ModelFormatFGA
 		}
 	case !isOptional:
-		return cmd.Help() //nolint:wrapcheck
+		_ = cmd.Help() // print out the help message so users know what the command expects
+
+		return fmt.Errorf("%w", clierrors.ErrModelInputMissing)
 	}
 
 	return nil

internal/clierrors/clierrors.go

@@ -27,6 +27,7 @@ var (
 	ErrInvalidFormat              = errors.New("invalid format")
 	ErrStoreNotFound              = errors.New("store not found")
 	ErrAuthorizationModelNotFound = errors.New("authorization model not found")
+	ErrModelInputMissing          = errors.New("model input not provided")
 )
 
 func ValidationError(op string, details string) error {