message: Don't err if there is no configure.
diff: @@ -247,7 +247,7 @@ class Drake:
  g = self.__globals
  module = self.__module
  configure = self.__configure
  - specs = inspect.getfullargspec(configure)
  + specs = inspect.getfullargspec(configure) if configure is not None else None
  # Parse arguments
  options = {
  '--jobs' : lambda j: self.jobs_set(j),
  @@ -269,7 +269,7 @@ class Drake:
  if match:
  name = match.group(1).replace('-', '_')
  value = match.group(2)
  - if name in specs.args:
  + if specs is not None and name in specs.args:
  kwcfg[name] = value
  del args[i]
  continue
  @@ -285,6 +285,7 @@ class Drake:
  callbacks.append(cb)
  continue
  i += 1
  + if specs is not None:
  # Map arguments
  effective = inspect.getcallargs(configure, *cfg, **kwcfg)
  # Apply annotations
  