runelite-client: Don't fail on invalid config values.

runelite-client/src/main/java/net/runelite/client/config/ConfigInvocationHandler.java

@@ -78,16 +78,20 @@ class ConfigInvocationHandler implements InvocationHandler
 
 			// Convert value to return type
 			Class<?> returnType = method.getReturnType();
-			Object objectValue = ConfigManager.stringToObject(value, returnType);
-
-			// objectValue automatically gets unboxed
-//			if (!objectValue.getClass().equals(returnType))
-//			{
-//				log.warn("Unable to convert return type for configuration item {}.{}: {}", group.keyName(), item.keyName(), returnType);
-//				return null;
-//			}
-
-			return objectValue;
+			
+			try
+			{
+				return ConfigManager.stringToObject(value, returnType);
+			}
+			catch (Exception e)
+			{
+				log.warn("Unable to unmarshal {}.{} ", group.keyName(), item.keyName(), e);
+				if (method.isDefault())
+				{
+					return callDefaultMethod(proxy, method, args);
+				}
+				return null;
+			}
 		}
 		else
 		{

runelite-client/src/main/java/net/runelite/client/config/ConfigManager.java

@@ -254,7 +254,14 @@ public class ConfigManager
 		String value = getConfiguration(groupName, key);
 		if (!Strings.isNullOrEmpty(value))
 		{
-			return (T) stringToObject(value, clazz);
+			try
+			{
+				return (T) stringToObject(value, clazz);
+			}
+			catch (Exception e)
+			{
+				log.warn("Unable to unmarshal {}.{} ", groupName, key, e);
+			}
 		}
 		return null;
 	}