Closes #198

It was possible that we initiated a loop for bot that was connected, and it got disconnected shortly after, which could result in infinite loop if DistributeKeys was disabled (and nothing would change that bot to other one)

Author: JustArchi

ArchiSteamFarm/Bot.cs

@@ -777,9 +777,13 @@ private async Task<string> ResponseRedeem(ulong steamID, string message, bool va
 						continue; // Without changing the bot
 					}
 
-					if (currentBot.SteamClient.IsConnected) {
+					if (!currentBot.SteamClient.IsConnected) {
+						currentBot = null; // Either bot will be changed, or loop aborted
+					} else {
 						ArchiHandler.PurchaseResponseCallback result = await currentBot.ArchiHandler.RedeemKey(key).ConfigureAwait(false);
-						if (result != null) {
+						if (result == null) {
+							currentBot = null; // Either bot will be changed, or loop aborted
+						} else {
 							switch (result.PurchaseResult) {
 								case ArchiHandler.PurchaseResponseCallback.EPurchaseResult.DuplicatedKey:
 								case ArchiHandler.PurchaseResponseCallback.EPurchaseResult.InvalidKey: