fix search error for no results

[grmbyrn]

Fix for The search box in blog section does not work #108. Search worked when there was a result but when the user entered something in search bar which had no result then searched again nothing would appear when the user searched for something which should return a result.

To prevent this issue, the functions in lib/utils/search.ts ensure that if there is no search term or no matching results, they return default values (like empty arrays or the original text) and properly handle new searches, ensuring the UI remains responsive and updates with results as expected.

export function searchPostsIndex(searchTerm: string) {
    if (!searchTerm) {
	return [];
    }

function replaceTextWithMarker(text: string, match: string) {
    if (!text) {
	return '';
    }

    if (!match) {
	return text;
    }

function getMatches(text: string, searchTerm: string, limit = 1) {
    if (!searchTerm) {
	return [];
    }

[josecelano]

ACK b6822db