Merge pull request 'Fixed user info command (#152)' (#158) from #152 into 0.3

Reviewed-on: sh-edraft.de/kd_discord_bot#158
Reviewed-by: Ebola-Chan <nick.jungmann@gmail.com>
Closes #152

kdb-bot/src/modules/base/command/user_group.py

@@ -96,8 +96,9 @@ class UserGroup(DiscordCommandABC):
             color=int('ef9d0d', 16)
         )
 
-        ontime = self._user_joined_voice_channel.get_user_joined_voice_channels_by_user_id(user.user_id).sum(
-            lambda join: round((join.leaved_on - join.joined_on).total_seconds() / 3600, 2))
+        ontime = self._user_joined_voice_channel.get_user_joined_voice_channels_by_user_id(user.user_id)\
+            .where(lambda x: x is not None)\
+            .sum(lambda join: round((join.leaved_on - join.joined_on).total_seconds() / 3600, 2))
 
         embed.add_field(name=self._t.transform('modules.base.user.atr.id'), value=member.id)
         embed.add_field(name=self._t.transform('modules.base.user.atr.name'), value=member.name)