emulating window.console to prevent undefined errors for older browser (like IE7/8) which have no native console object or haven't got appropriate log methods

gistfile1.js

/*
 *  Initialize console object used for logging in javascript code.
 *  For case when console object is not present (old browsers) use dump implementation.
 */

window.console = window.console || {}; // in old browsers like IE7 there is no console object

console.info = console.info || function() {};
console.error = console.error || function() {};
console.warn = console.warn || function() {};
console.debug = console.debug || console.info; // in later IE there is console but without debug method, so fallback to info