Update nach upstream

xquery/cache.xqm

@@ -37,8 +37,8 @@ declare function my-cache:doc($docURI as xs:string, $callback as function() as i
         typeswitch($lease)
         case xs:dayTimeDuration return
             ($currentDateTimeOfFile + $lease) lt current-dateTime()
-            or empty($lease) 
             or empty($currentDateTimeOfFile)
+        case empty() return true() 
         case function() as xs:boolean return $lease($currentDateTimeOfFile)
         default return error($my-cache:UNSUPPORTED_PARAMETER_VALUE_ERROR, 'The parameter value for $lease must be xs:dayTimeDuration()? or a function reference which must take exactly one argument.')
     return