fix: "No body available" #262

When the request returns an empty body, choose to skip it and print the account ID and UID information, leaving it for the user to investigate themselves. Otherwise, the IMAP download process will be blocked by this.

crates/core/src/envelope/extractor.rs

@@ -50,9 +50,17 @@ pub async fn extract_envelope_and_store_it(
         .map(|d| d.timestamp_millis())
         .unwrap_or(0);
     let uid = fetch.uid.unwrap_or(0);
-    let body = fetch
-        .body()
-        .ok_or_else(|| raise_error!("No body available".into(), ErrorCode::InternalError))?;
+    let body = match fetch.body() {
+        Some(b) => b,
+        None => {
+            tracing::warn!(
+                account_id,
+                uid = fetch.uid,
+                "FETCH response has no body, skipping message"
+            );
+            return Ok(());
+        }
+    };
     let size = fetch.size.unwrap_or(body.len() as u32);
     extract_envelope_core(body, uid, size, internal_date, account_id, mailbox_id).await
 }