How to disable image caption in views block?
If you're not picky, a possible alternative quick fix is to just hide it with CSS. This way you don't have to worry about or spend time patching the module. 

You can do it like this:

.image-field-caption { display: none; } 


Note that the above will hide all captions, if you only want to hide the captions of a specific view: 

.view-id-[name] .image-field-caption { display: none; }