Sudo -> Subscriber Import UI breaks on CSV parser failures

[Nadil-K]

{"message":"Unhandled exception in API","context":{"exception":{"class":"DateMalformedStringException","message":"Failed to parse time string (xxxxxxxx) at position 0 (j): The timezone could not be found in the database","code":0,"file":"/app/backend/src/Service/Import/Parser/CsvParser.php:118"},"request":{"method":"GET","path":"/api/sudo/subscriber-imports/xx","query":{"limit":"30","offset":"0"},"body":[],"headers":{"host":["post.hyvor.com"],"content-type":["application/json"],"sec-fetch-mode":["cors"],"cf-visitor":["{"scheme":"https"}"],"referer":["https://post.hyvor.com/sudo/imports"],"accept-language":["en-GB,en-US;q=0.9,en;q=0.8"],"x-php-ob-level":["0"]}}},"level":500,"level_name":"CRITICAL","channel":"app","datetime":"2026-01-16T15:17:42.957962+00:00","extra":{}}