feat: Add new error check for empty configuration

internal/pkg/template/manifest/file.go

@@ -39,6 +39,7 @@ func evaluateFile(ctx context.Context, file *filesystem.RawFile, jsonnetCtx *jso
 	}
 
 	content := newFile()
+	// Decode string and set Configs object
 	if err := json.DecodeString(jsonContent, content); err != nil {
 		return nil, err
 	}
@@ -86,17 +87,25 @@ func (f *file) validate(ctx context.Context) error {
 	return nil
 }
 
-func (f *file) records() []model.ObjectManifest {
+func (f *file) records() (oms []model.ObjectManifest, err error) {
 	out := make([]model.ObjectManifest, 0, len(f.Configs))
 	for _, config := range f.Configs {
+		if config == nil {
+			continue
+		}
+
 		out = append(out, &config.ConfigManifest)
 		for _, row := range config.Rows {
 			row.ComponentID = config.ComponentID
 			row.ConfigID = config.ID
 			out = append(out, row)
 		}
 	}
-	return out
+	if len(out) == 0 {
+		return nil, errors.New("unable to create template using invalid manifest configuration")
+	}
+
+	return out, nil
 }
 
 func (f *file) setRecords(records []model.ObjectManifest) {

internal/pkg/template/manifest/manifest.go

@@ -58,8 +58,14 @@ func (f *File) Evaluate(ctx context.Context, jsonnetCtx *jsonnet.Context) (*Mani
 	// Create manifest
 	m := New()
 
+	// Get records
+	records, err := content.records()
+	if err != nil {
+		return nil, errors.Errorf(`cannot load configurations from manifest "%s": %w`, f.file.Path(), err)
+	}
+
 	// Set records
-	if err := m.records.SetRecords(content.records()); err != nil {
+	if err := m.records.SetRecords(records); err != nil {
 		return nil, errors.Errorf(`cannot load manifest: %w`, err)
 	}