Fixed the Modulo and Not block if their input is left blank.
Fixed the Modulo and Not block if their input is left blank.

- Added a default input in the modulo block and Not block so that it does not throw an error when the program is sent to Jobe server
uccser/cs-unplugged,uccser/cs-unplugged,uccser/cs-unplugged,uccser/cs-unplugged