input: Write a function to check if an element exists within a given list of integers. The function should return True if the element is found and False otherwise. If the given list is empty, the function should return False.
  
  def element_exists(elem, list_int):
    return elem in list_int
  
  assert element_exists(3, [1, 2, 3, 4])==True
  assert element_exists(5, [1, 2, 3, 4])==False
  assert element_exists(0, [])==False
output: def element_exists(elem, list_int):
    return elem in list_int