Merge pull request #5792 from RocketChat/fix-internalhubot-username

Migration for internal hubot username

server/startup/migrations/v083.js

+RocketChat.Migrations.add({
+	version: 83,
+	up: function() {
+		if (RocketChat && RocketChat.models && RocketChat.models.Settings && RocketChat.models.Users) {
+			var setting = RocketChat.models.Settings.findOne({ _id: 'InternalHubot_Username' });
+			if (setting && setting.value) {
+				var username = setting.value;
+				var user = RocketChat.models.Users.findOne({ username: username });
+				if (!user && setting.value === 'Rocket.Cat') {
+					RocketChat.models.Settings.update({ _id: 'InternalHubot_Username' }, { $set: { value: 'rocket.cat', packageValue: 'rocket.cat' } });
+				}
+			}
+		}
+	}
+});