Address clippy lints.

deepwell/src/services/blob/service.rs

@@ -265,7 +265,7 @@ impl BlobService {
 /// Helper method to parse out an S3 error response and print the message (if any).
 fn s3_error<T>(response: &ResponseData, action: &str) -> Result<T> {
     let error_message = match str::from_utf8(response.bytes()) {
-        Ok(m) if m.is_empty() => "(no content)",
+        Ok("") => "(no content)",
         Ok(m) => m,
         Err(_) => "(invalid UTF-8)",
     };

deepwell/src/services/view/service.rs

@@ -363,7 +363,7 @@ impl ViewService {
         // Get user data from session token (if present)
         let user_session = match session_token {
             None => None,
-            Some(token) if token.is_empty() => None,
+            Some("") => None,
             Some(token) => {
                 let session = SessionService::get(ctx, token).await?;
                 let user = UserService::get(ctx, Reference::Id(session.user_id)).await?;