The following rings were modified:

  * rings/padics/padic_capped_relative_element.pyx
  * rings/padics/padic_fixed_mod_element.pyx
  * rings/padics/padic_ZZ_pX_CR_element.pyx
  * rings/padics/padic_ZZ_pX_FM_element.pyx

The fix is simply to replace the ArithmeticError by a `return self.parent(1)`.