Only save source for non-solution cells
Only save source for non-solution cells

ellisonbg/nbgrader,jupyter/nbgrader,modulexcite/nbgrader,alope107/nbgrader,jupyter/nbgrader,ellisonbg/nbgrader,ellisonbg/nbgrader,jhamrick/nbgrader,jupyter/nbgrader,MatKallada/nbgrader,EdwardJKim/nbgrader,MatKallada/nbgrader,dementrock/nbgrader,EdwardJKim/nbgrader,dementrock/nbgrader,modulexcite/nbgrader,jdfreder/nbgrader,alope107/nbgrader,jhamrick/nbgrader,EdwardJKim/nbgrader,jhamrick/nbgrader,jupyter/nbgrader,jhamrick/nbgrader,ellisonbg/nbgrader,jupyter/nbgrader,EdwardJKim/nbgrader,jdfreder/nbgrader