Content Assist doesn't shows proposals for JSF Resource Bundles and image file paths

The issue is found by JstJspAllTests.testCAForIDTest JUnit TestCase (JBIDE-5844)

Steps to reproduce:

EXECUTE: Create JSF Facelets KickStart project
EXECUTE: Open inputname.xhtml file in JBoss Tools HTML Editor
EXECUTE: Find <f:loadBundle /> tag, clear its "basename" attribute value, place text cursor in it (<f:loadBundle basename="|" />) and press Ctrl-Space to invoke CA
ASSERT: There must be "resources" CA proposal amount the other propposals (FAILED)

EXECUTE: Add "img" folder to WebContent and place some image file into this folder.
EXECUTE: Insert <h:graphicImage url="" /> into a valid region of inputname.xhtml file in editor, place text cursor into the value of "url" attribute (url="|") and press Ctrl-Space to invoke CA
ASSERT: There must be "/img" folder CA proposal amount the other propposals (FAILED)