Fix a bug in assignment_submission_spec.rb Since the error generated by system will be different under different internet environment, I just removed the specific error message.
Fix a bug in assignment_submission_spec.rb
Since the error generated by system will be different under different internet environment, I just removed the specific error message.

joshio1/expertiza,sid5788/expertiza,michaelamoran/expertiza,rmmaily/expertiza,sid5788/expertiza,redsock88/expertiza,mhhassan/expertiza,joshio1/expertiza,kira0992/expertiza,KunmiaoYang/expertiza,kira0992/expertiza,akshayjain114/expertiza,rmmaily/expertiza,KunmiaoYang/expertiza,sid5788/expertiza,expertiza/expertiza,expertiza/expertiza,urmilparikh95/expertiza,redsock88/expertiza,redsock88/expertiza,urmilparikh95/expertiza,KunmiaoYang/expertiza,arpitashekhar/expertiza,arpitashekhar/expertiza,expertiza/expertiza,mhhassan/expertiza,akshayjain114/expertiza,mhhassan/expertiza,michaelamoran/expertiza,kira0992/expertiza,rmmaily/expertiza,akshayjain114/expertiza,ApertureScienceInnovators/expertiza,ApertureScienceInnovators/expertiza,joshio1/expertiza,arpitashekhar/expertiza,urmilparikh95/expertiza,urmilparikh95/expertiza,kira0992/expertiza,KunmiaoYang/expertiza,michaelamoran/expertiza,sid5788/expertiza,joshio1/expertiza,mhhassan/expertiza,ApertureScienceInnovators/expertiza,ApertureScienceInnovators/expertiza,akshayjain114/expertiza,arpitashekhar/expertiza,rmmaily/expertiza,expertiza/expertiza,redsock88/expertiza,michaelamoran/expertiza