Small fix

Author: Karolina Karolak

src/main/java/com/capgemini/training/appointment_booking_app/common/converter/SpecializationConverter.java

@@ -9,15 +9,18 @@
 public class SpecializationConverter implements AttributeConverter<Specialization, String> {
 
 	@Override
-	public String convertToDatabaseColumn(Specialization attribute) {
+	public String convertToDatabaseColumn(Specialization specialization) {
+		
+		return specialization != null ? specialization.getName() : null;
 
-		return attribute != null ? attribute.getName() : null;
 	}
 
 	@Override
-	public Specialization convertToEntityAttribute(String dbData) {
-		
-		return Specialization.getByName(dbData);
-	}
+    public Specialization convertToEntityAttribute(String dbData) {
+        if (dbData == null) {
+            return null;
+        }
+        return Specialization.getByName(dbData);
+    }
 
 }