Fix: Skill description service cb could fail

Duration.sleep does not exist
However there is no point in creating this service before the skills are
loaded anyway.

skiros2_skill/skiros2_skill/ros/skill_manager.py

@@ -387,11 +387,8 @@ def __init__(self):
  self.sm.observe_tick(self._on_tick)
 
  # Init skills
- self._initialized = False
- self._getskills = self.create_service(srvs.ResourceGetDescriptions, self._node_name + '/get_skills', self._get_descriptions_cb)
  self._init_skills()
- # Duration(nanoseconds=5 * (10**8)).sleep()
- self._initialized = True
+ self._getskills = self.create_service(srvs.ResourceGetDescriptions, self._node_name + '/get_skills', self._get_descriptions_cb)
 
  # Start communications
  self._command = self.create_service(srvs.SkillCommand, self._node_name + '/command', self._command_cb)
@@ -494,8 +491,6 @@ def _get_descriptions_cb(self, msg, to_ret):
  """
  @brief Returns available skills. Called when receiving a command on ~/get_descriptions
  """
- while not self._initialized:
- Duration(nanoseconds=(10**8)).sleep()
  for s in self.sm.skills:
  to_ret.list.append(skill2msg(s))
  return to_ret