ie console error improved http://www.elijahmanor.com/grunt-away-those-pesky-console-log-statements/

console.js

  /**
   * Protect window.console method calls, e.g. console is not defined on IE
   * unless dev tools are open, and IE doesn't define console.debug
   */
  (function(exports) {
    if (!exports.console) exports.console = {};

    // union of Chrome, FF, IE, and Safari console methods
    var m = [
      "log", "info", "warn", "error", "debug", "trace", "dir", "group",
      "groupCollapsed", "groupEnd", "time", "timeEnd", "profile", "profileEnd",
      "dirxml", "assert", "count", "markTimeline", "timeStamp", "clear"
    ];
    // define undefined methods as noops to prevent errors
    for (var i = 0; i < m.length; i++) {
      if (!exports.console[m[i]]) exports.console[m[i]] = function() {};
    } 
  })(this);





// another version
// Avoid `console` errors in browsers that lack a console.
(function() {
    var method;
    var noop = function () {};
    var methods = [
      'assert', 'clear', 'count', 'debug', 'dir', 'dirxml', 'error',
      'exception', 'group', 'groupCollapsed', 'groupEnd', 'info', 'log',
      'markTimeline', 'profile', 'profileEnd', 'table', 'time', 'timeEnd',
      'timeStamp', 'trace', 'warn'
    ];
    var length = methods.length;
    var console = (window.console = window.console || {});
 
    while (length--) {
      method = methods[length];
 
      // Only stub undefined methods.
      if (!console[method]) {
        console[method] = noop;
      }
    }
}());