v1.1.0

were added two more methods to comberloader,
failback and fail.

fail

Use this handler in case the module fails to import

import comberload
comberload("mod1", "mod2")
def first():
   pass

@first.fail
def second(e):
   pass

failback

This is what I advice to use, it uses the default handler in case the module is
not loaded due to error or any else.

import comberload

comberload("mod1", "mod2")
def first():
   pass

@first.failback
def second(e=None):  # e will be passed if module fails to load
   pass