Corrected a couple errors with twitch/picarto/da

cogs/da.py

@@ -76,7 +76,7 @@ class Deviantart:
                     result = cache.get(da_name, None)
                     if result is None:
                         params['username'] = da_name
-                        data = await utils.request(base_url, payload=params)
+                        data = await utils.request(self.base_url, payload=params)
 
                         log.warning("DA responded with {}".format(data))
                         result = data['results'][0]

cogs/picarto.py

@@ -77,6 +77,8 @@ class Picarto:
                             channel = self.bot.get_channel(channel_id)
                             # Get the member that has just gone live
                             member = discord.utils.get(server.members, id=m_id)
+                            if member is None:
+                                continue
 
                             fmt = "{} has just gone live! View their stream at {}".format(member.display_name, url)
                             await self.bot.send_message(channel, fmt)

cogs/twitch.py

@@ -70,6 +70,8 @@ class Twitch:
                             channel = self.bot.get_channel(channel_id)
                             # Get the member that has just gone live
                             member = discord.utils.get(server.members, id=m_id)
+                            if member is None:
+                                continue
 
                             fmt = "{} has just gone live! View their stream at {}".format(member.display_name, url)
                             await self.bot.send_message(channel, fmt)