ProcessingChain, next method, handler param

[smart--petea]

in ProcesingChain.prototype.runChain the param with name handler is not used as function or object. The main meaning is to provide a name for filtering and search.
Maybe to replace it with the param named handlerName.
From the content of next function it result that there can be the situation when handlerName(or handler ) is undefined. This result from the snippet

if(handler) {
       var firstItem = self.findFirstValidItem(handler.name)
      ....
}

In this case, for handlerName=undefined (or handler=undefined) the snippet

for(var idx = currentItem + 1; idx < chain.length; idx++) {
     if(chain[idx.names&& chain[idx].names.indexOf(handler.name != -1 || !chain[idx].names) {
             break
      }
}

will be of nonsense.

In this case the function runChaid will become

ProcessingChain.prototype.runChain = function( req, res, finalFn, handler ) {
    ...
    var next = function(err) {
        ...
        if ( currentItem < totalItems - 1 ) {
                var idx = currentItem + 1;
                if(handlerName) {
                 for(; idx < chain.length; idx++) {
                     if( (chain[idx].names && chain[idx].names.indexOf(handlerName) != -1) || !chain[idx].names) {
                        break
                    }
               } 
                        } 
            ...
        } else {
            ...
        }
    }
    if(handlerName) {
        var firstItem = self.findFirstValidItem(handlerName)
               ...
    } else {
               ...
    }
};

[smart--petea]

Maybe to advance the filtering by providing not a name but an array of names, e.g

ProcessingChain.prototype.runChain = function( req, res, finalFn, [name1, name2, name3] )