Bug 117493 [content assist] CompletionRequestor#completionFailure(IProblem)) is ignored
This got introduced after 3.2 M1 (i.e. broken in 3.2 M2 and newer). If completion fails we now always show: "No completion available." instead of the real error text. Example: for (Iterator i=things.iterator(); i.<ctrl-space> // Iterator not yet imported)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/java/ContentAssistProcessor.java
* and returned.
	 * 
	 * @param contexts the list of collected proposals (element type:
	 *        {@link IContextInformation})
	 * @param monitor a progress monitor
	 * @return the list of filtered and sorted proposals, ready for
	 *         display (element type: {@link IContextInformation})
	 */
	protected List filterAndSortContextInformation(List contexts, IProgressMonitor monitor) {
		return contexts;
	}
	/**
	 * Sets this processor's set of characters triggering the activation of the
	 * completion proposal computation.
	 *
	 * @param activationSet the activation set
	 */
	public final void setCompletionProposalAutoActivationCharacters(char[] activationSet) {
		fCompletionAutoActivationCharacters= activationSet;
	}
	/*
	 * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getCompletionProposalAutoActivationCharacters()
	 */
	public final char[] getCompletionProposalAutoActivationCharacters() {
		return fCompletionAutoActivationCharacters;
	}
	/*
	 * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getContextInformationAutoActivationCharacters()
	 */
	public char[] getContextInformationAutoActivationCharacters() {