fix possible false-positive in unit-test

Author: ivandrofly

src/Helpers/CsvResponseParser.cs

@@ -9,6 +9,10 @@ public IReadOnlyList<Language> ParseGetAvailablesLanguages(string response)
             var readonlyList = new List<Language>();
             foreach (var isoTwoLetter in response.Split(','))
             {
+                if (string.IsNullOrWhiteSpace(isoTwoLetter))
+                {
+                    continue;
+                }
                 var lang = new Language(isoTwoLetter);
                 readonlyList.Add(lang);
             }