When not all fields are filled a "notfound image" is shown

Well, I have a content type with an image field cck. The maximum number of values users can enter for this field is set to 3. In the page of the content type i show those pictures with a View (SlideShow -> Singleframe). Little thumbnails at the bottom of the main image, and the main changes when hovering the thumbnails. That's great... but if a user inserts 1 or 2 images (instead of 3) there still is the third thumbnails showing a "not found" image. Hovering it make the main too go blank. I temporary resolved this issue setting the maximum number of image to insert to undefined.
But I suspect somewhere in the code there's a check that look for maximum number of items instead of actual number of inserted items, unfortunaly I couldn't find that.

(plus) Trying to follow the above suggestions:

1) no, I have no sites with the problem described, since I had to fix it.

2) Not sure what is this for (anyways):

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3)

<div id="views_slideshow_singleframe_pager_rotor-block_1" class="views_slideshow_singleframe_pager views_slideshow_pagerThumbnails">

<div class="pager-item pager-num-1 first even">
<a href="#"><img src="one.png"></a>
</div>

<div class="pager-item pager-num-2 odd activeSlide">
<a href="#"><img src="two.jpg"></a>
</div>

<div class="pager-item pager-num-3 last even">
<a href="#"><img src="undefined"></a>
</div>

</div>

BUT, if I set maximum number of images for the content type as undefined:

<div id="views_slideshow_singleframe_pager_rotor-block_1" class="views_slideshow_singleframe_pager views_slideshow_pagerThumbnails">

<div class="pager-item pager-num-1 first even activeSlide">
<a href="#"><img src="one.jpg"></a>
</div>

<div class="pager-item pager-num-2 last odd">
<a href="#"><img src="two.jpg"></a>
</div>

</div>

... and as you can see the third "undefined" image is gone!