conditional_uri_does_not_exist

DON'T reference files that do not exist in conditional imports.

Code may fail at runtime if the condition evaluates such that the missing file needs to be imported.

BAD:

import 'file_that_does_exist.dart'
  if (condition) 'file_that_does_not_exist.dart';

GOOD:

import 'file_that_does_exist.dart'
  if (condition) 'file_that_also_does_exist.dart';