Bug 144522 [Field Assist] - should proposal popup ever open if empty?
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
* not filter the proposals based on the specified filter text.
		 */
		private IContentProposal[] getProposals(String filterString) {
			if (proposalProvider == null || !isValid()) {
				return null;
			}
			int position = insertionPos;
			if (position == -1) {
				position = getControlContentAdapter().getCursorPosition(
						getControl());
			}
			String contents = getControlContentAdapter().getControlContents(
					getControl());
			IContentProposal[] proposals = proposalProvider.getProposals(
					contents, position);
			if (filterStyle != FILTER_NONE) {
				return filterProposals(proposals, filterString);
			}
			return proposals;
		}
		/*
		 * Show the proposal description in a secondary popup.
		 */
		private void showProposalDescription(String description) {
			
			
			if (!pendingDescriptionUpdate && description != null) {