aquatic_http_protocol: fix serde_quickcheck_identity_test

Since empty info hash Vec is no longer allowed, don't allow
it in test data and expect parsing to succeed.

aquatic_http_protocol/src/request.rs

@@ -355,14 +355,23 @@ mod tests {
     #[test]
     fn quickcheck_serde_identity_request() {
         fn prop(request: Request) -> TestResult {
-            if let Request::Announce(AnnounceRequest {
+            match request {
+                Request::Announce(AnnounceRequest {
                     key: Some(ref key), ..
-            }) = request
+                }) => {
-            {
                     if key.len() > 30 {
                         return TestResult::discard();
                     }
                 }
+                Request::Scrape(ScrapeRequest {
+                    ref info_hashes,
+                }) => {
+                    if info_hashes.is_empty() {
+                        return TestResult::discard();
+                    }
+                }
+                _ => {}
+            }
 
             let mut bytes = Vec::new();