fix: deal with empty haves first

Author: JamesPatrickGill

gix-protocol/src/serve/upload_pack/function.rs

@@ -45,13 +45,13 @@ pub fn serve_upload_pack_v1<R: Read, W: Write>(
             }
         }
 
-        if !found_common {
-            write_nak(&mut connection.writer)?;
-        }
-
         if haves.done {
             break;
         }
+
+        if !found_common {
+            write_nak(&mut connection.writer)?;
+        }
         connection.line_provider.reset();
     }