Bug resolved - While saving sub-types of Courses (NUSSD Course) & (Announced Course)


**Functionalities implemented:**

1) Bug resolved: While saving sub-types of Courses (NUSSD Course) & (Announced Course)

   - Since using course_create_edit() function for saving both sub-type's GSystem, code was written explicilty to fetch few fields which exists only in case of 'Announced Course'. And it was throwing error while attempting to save/update NUSSD course as those fields doesn't exist for this GSystemType.
   
   - File modified:
   
     1) views/course.py
     
        - Checking whether request object has certain fields, if exists only then process those respective field(s); otherwise continue with code!