Auto-fix clippy::collapsible_if violations (#36428)

Release Notes:

- N/A

crates/google_ai/src/google_ai.rs

@@ -106,10 +106,9 @@ pub fn validate_generate_content_request(request: &GenerateContentRequest) -> Re
         .contents
         .iter()
         .find(|content| content.role == Role::User)
+        && user_content.parts.is_empty()
     {
-        if user_content.parts.is_empty() {
-            bail!("User content must contain at least one part");
-        }
+        bail!("User content must contain at least one part");
     }
 
     Ok(())