    Fix exception in callback function.
    Fix exception in callback function.

    Exception would occur in the nope condition if yepnope had this definition:

    yepnope({
      test: Modernizr.geolocation,
      yep: {
        'rstyles': 'regular-styles.css'
      },
      nope: {
        'mstyles': 'modified-styles.css',
        'geopoly': 'geolocation-polyfill.js'
      },
      callback: {
        'rstyles': function (url, result, key) {
          alert('This is the regular styles!');
        }
      }
    })

    Fixed by checking to see if innerCb is defined before attempting to call innerCb
(In the official byte minimized way :-) )

bugdebugger/yepnope.js,SlexAxton/yepnope.js,SlexAxton/yepnope.js,bugdebugger/yepnope.js