commands: implement Default for empty req/res structs

src/commands.rs

@@ -189,6 +189,12 @@ macro_rules! empty_command_request {
             pub struct [<$name Request>];
         }
 
+        impl std::default::Default for paste::paste! { [<$name Request>] } {
+            fn default() -> Self {
+                paste::paste! { [<$name Request>] }
+            }
+        }
+
         impl crate::commands::CommandRequest for paste::paste! { [<$name Request>] } {
             const COMMAND: &'static str = $command_name;
             const MIN_ARGS: u32 = 0;
@@ -216,6 +222,12 @@ macro_rules! empty_command_response {
             pub struct [<$name Response>];
         }
 
+        impl std::default::Default for paste::paste! { [<$name Response>] } {
+            fn default() -> Self {
+                paste::paste! { [<$name Response>] }
+            }
+        }
+
         impl crate::commands::CommandResponse for paste::paste! { [<$name Response>] } {
             fn parse(
                 _parts: crate::commands::ResponseAttributes<'_>,