adding formatter for list in spreadsheet (ods, xlsx)

Export/Formatter/CSVListFormatter.php

@@ -206,6 +206,14 @@ class CSVListFormatter implements FormatterInterface
             $this->prepareCacheLabels();
         }
         
+        if (!\array_key_exists($key, $this->labelsCache)){
+            throw new \OutOfBoundsException(sprintf("The key \"%s\" "
+                . "is not present in the list of keys handled by "
+                . "this query. Check your `getKeys` and `getLabels` "
+                . "methods. Available keys are %s.", $key, 
+                \implode(", ", \array_keys($this->labelsCache))));
+        }
+        
         return $this->labelsCache[$key]($value);
     }