fixed the clear() command crashing upon usage without any arguments

as a treat, here is an example script! this script utilizes the special characters for printing the heart, so go to right after the DB and press ctrl+b.

clear(0)
sx=0
sy=0
!bg=0
fg=5
print(" 0 0 ")
fg=10
print("00000")
fg=2
print("00000")
fg=10
print(" 000 ")
fg=5
print("  0  ")
print("")
fg=random(0|15)
print("trans people are amazing! DB")
wait(0.2)
loop()