Fixed a couple arg parsing errors

src/Discord.Net.Commands/CommandMap.cs

@@ -31,6 +31,8 @@ namespace Discord.Commands
 				CommandMap nextGroup;
 				if (_subCommands.TryGetValue(nextPart, out nextGroup))
 					return nextGroup.GetMap(index + 1, parts);
+				else
+					return null;
 			}
 			return this;
 		}

src/Discord.Net.Commands/CommandParser.cs

@@ -148,7 +148,12 @@ namespace Discord.Commands
 			}
 
 			if (argList.Count < command.MinArgs)
-				return CommandErrorType.BadArgCount;
+			{
+				/*if (command._parameters[command._parameters.Length - 1].Type == ParameterType.Unparsed)
+					argList.Add("");
+				else*/
+					return CommandErrorType.BadArgCount;
+			}
 
 			args = argList.ToArray();
 			return null;