Minor doc/exception edits

src/Discord.Net.Commands/CommandServiceConfig.cs

@@ -12,10 +12,7 @@
         /// <summary> Gets or sets the minimum log level severity that will be sent to the Log event. </summary>
         public LogSeverity LogLevel { get; set; } = LogSeverity.Info;
 
-        /// <summary> 
-        /// Gets or sets whether RunMode.Sync commands should push exceptions up to the caller. 
-        /// If false or an RunMode.Async command, exceptions are only reported in the Log event. 
-        ///</summary>
+        /// <summary> Gets or sets whether RunMode.Sync commands should push exceptions up to the caller. </summary>
         public bool ThrowOnError { get; set; } = true;
     }
-}
+}

src/Discord.Net.Commands/Dependencies/DependencyMap.cs

@@ -50,9 +50,7 @@ namespace Discord.Commands
         public bool TryAddFactory<T>(Func<T> factory) where T : class
         {
             var type = typeof(T);
-            if (_typeBlacklist.Contains(type))
-                throw new InvalidOperationException($"{type.FullName} is used internally and cannot be added as a dependency");
-            if (map.ContainsKey(type))
+            if (_typeBlacklist.Contains(type) || map.ContainsKey(type))
                 return false;
             map.Add(type, factory);
             return true;