JBIDE-17849 CSS Hyperlinks aren't working on non-WTP projects

An utility helper method is added due to find pages in projects that are not the WTP ones
(has no web-roots that can be achieved by WTP methods)

Signed-off-by: vrubezhny <vrubezhny@exadel.com>
You have an error in your suggestion in last sentence: Why did you added '/projectName/filePath' to a project path? It's not true: filePath argument value doesn't start with a project name, so there will be only the following expression: getFile(container.append(filePath)) == "/projectName/filePath" which is correct.