frappy.show_state: do not show partial status

devices.py

@@ -352,7 +352,7 @@ class FrappyConfig(Device):
         self._back_to_normal = None  # reset 'back to normal' machanism
         stickarg = stick
 
-        _, changes, fm = to_consider = self.to_consider()
+        need_change, changes, fm = to_consider = self.to_consider()
         confirmed = fm.sea.get_cfg(config.instrument, 'sea', True).split('/', 1)[0]
         if args:
             if main is not None:
@@ -384,7 +384,7 @@ class FrappyConfig(Device):
                         raise TypeError('got multiple values for addons')
                     addons = ','.join(alist)
         elif main is None and stick is None and addons is None:  # bare frappy() command
-            if update:
+            if update and need_change:
                 self.update()
             else:
                 self.show_state(False, to_consider)
@@ -427,9 +427,10 @@ class FrappyConfig(Device):
             session.log.info('  %s', '  '.join(v.ljust(w) for w, v in zip(wid, row)))
         if self._rebuild_env:
             session.log.info('  %s', self._rebuild_env)
-        alternative = f" or {all_info(kwargs, '')}" if kwargs else ''
-        session.log.info(' ')
-        session.log.info('  use frappy()%s to configure sample environment', alternative)
+        if kwargs:
+            alternative = f" or {all_info(kwargs, '')}" if kwargs else ''
+            session.log.info(' ')
+            session.log.info('  use frappy()%s to configure sample environment', alternative)
         session.log.info('  %s', 75*'_')
 
     def update(self, main=None, stick=None, addons=None):