fix: check the existence of publication, license and copyright before…

… the accession

cmd/mb3server/src/api-impl.go

@@ -254,9 +254,9 @@ func GetRecord(accession string) (*MbRecord, error) {
 			Modified: record.Date.Modified.String(),
 		},
 		Authors:     nil,
-		License:     *record.License,
-		Copyright:   *record.Copyright,
-		Publication: *record.Publication,
+		License:     "",
+		Copyright:   "",
+		Publication: "",
 		Project:     "",
 		Comments:    nil,
 		Compound: MbRecordCompound{
@@ -304,6 +304,18 @@ func GetRecord(accession string) (*MbRecord, error) {
 			},
 		},
 	}
+	// insert publication, license, copyright
+	if record.Publication != nil {
+		result.Publication = *record.Publication
+	}
+	if record.License != nil {
+		result.License = *record.License
+	}
+	if record.Copyright != nil {
+		result.Copyright = *record.Copyright
+	}
+
+	// insert authors
 	for _, author := range *record.Authors {
 		result.Authors = append(result.Authors, AuthorsInner{
 			Name:        author.Name,
@@ -325,7 +337,6 @@ func GetRecord(accession string) (*MbRecord, error) {
 
 	// insert annotation data
 	if record.Peak.Annotation != nil {
-
 		result.Peak.Annotation.Header = record.Peak.Annotation.Header
 
 		var annotationValues = [][]string{}