Made the "logLevel" property for the AppArguments protocol in the sample app target non-optional.

Samples/HummingbirdDocC/App/Parameters/SampleAppArguments.swift

@@ -38,6 +38,6 @@ extension SampleApp {
             name: .long,
             help: "A log level to configure in a type that interacts with the logging system."
         )
-        var logLevel: Logger.Level?
+        var logLevel: Logger.Level = .trace
     }
 }

Samples/HummingbirdDocC/App/Protocols/AppArguments.swift

@@ -26,7 +26,7 @@ protocol AppArguments {
     var port: Int { get }
     
     /// A log level to configure in a type that interacts with the logging system.
-    var logLevel: Logger.Level? { get }
+    var logLevel: Logger.Level { get }
     
 }
 

Samples/HummingbirdDocC/App/SampleApp.swift

@@ -35,7 +35,7 @@ extension SampleApp: AsyncParsableCommand {
         let builder = AppBuilder(logger: {
             var logger = Logger(label: "sample.hummingbird-docc.logger")
             
-            logger.logLevel = arguments.logLevel ?? .trace
+            logger.logLevel = arguments.logLevel
             
             return logger
         }())