Cannot call method 'toLowerCase' of undefined ferdinand.js

Initially I've got:

```plain
Uncaught TypeError: Cannot call method 'toLowerCase' of undefined ferdinand.js:996
```

I've added type check http://oapbuild.pl-lab.lucent.com:8080/#/c/11759/1/SDMExpertWeb/src/main/webapp/js/ferdinand/ferdinand.js
but then I've naturally got:

```plain
Collection view element has not been found ferdinand.js:253
Ferdinand.Log._message ferdinand.js:253
Ferdinand.Log.error ferdinand.js:282
Ferdinand.AbstractCollectionView.Ferdinand.AbstractView.extend.render ferdinand.js:1235
Ferdinand.AbstractCollectionView.Ferdinand.AbstractView.extend.initialize ferdinand.js:1154
Backbone.View backbone.js:987
child backbone.js:1531
child backbone.js:1531
child backbone.js:1531
child backbone.js:1531
Ferdinand.CompositeView.extend.onRendered rehomingAction_rehomingInfo:546
triggerEvents backbone.js:203
Backbone.Events.trigger backbone.js:146
Ferdinand.AbstractView.Backbone.View.extend.render ferdinand.js:1065
Ferdinand.CompositeView.extend.initialize rehomingAction_rehomingInfo:533
Backbone.View backbone.js:987
child backbone.js:1531
child backbone.js:1531
child backbone.js:1531
child backbone.js:1531
child backbone.js:1531
child backbone.js:1531
Ferdinand.Application.extend.onLoad rehomingAction_rehomingInfo:681
options.success ferdinand.js:547
options.success backbone.js:438
c jquery-1.10.0.min.js:4
p.fireWith jquery-1.10.0.min.js:4
k jquery-1.10.0.min.js:6
r jquery-1.10.0.min.js:6
Pager view element (el param) has not been found ferdinand.js:253
Collection view element has not been found ferdinand.js:253
Pager view element (el param) has not been found 
```