function handleMetaProperty (container, filePath, meta) {
    if (meta) {
        let fileMeta = container.__meta[filePath];
        if (!fileMeta) {
            fileMeta = {};
            container.__meta[filePath] = fileMeta;
        }
        
        for (let prop in meta) {
            fileMeta[prop] = meta[prop];
        }
    }
}
@param {PluginContainer} container 
@param {string} filePath 
@param {Object} meta