/**
     * Checks whether a given asset id is valid or not. Covered cases:
     * <li>
     *     <ul>If assetId is null or empty, then return false</ul>
     *     <ul>If assetId is not a valid uuid, then return false</ul>
     *     <ul>If assetId points to a non-existing node, then return false</ul>
     *     <ul>If assetId points to an existing node without binary data, then return false</ul>
     * </li>
     * @param assetId
     * @return
     */
    public boolean isValidAsset(String assetId) {
        Asset asset = getAsset(assetId);

        if (asset == null) {
            return false;
        }

        try {
            return asset.getContentStream() != null && asset.getContentStream().available() > 0;
        } catch (IOException e) {
            LOG.warn("The content associated with asset {} does not exist or cannot be accessed.", assetId, e);
        }

        return true;
    }

asset = getAsset(assetId)