[beam] Don't show '/' if count is empty in ItemCount

[agritheory]

This might work

<span>{{count ? '/' : ''}}{{ denominator }}</span>

[lauty95]

@agritheory

I think that the problem is when denominator value is empty, isn't it?
In this case, that value is shown as "Total."

What do you think about converting denominator to a number like this:

<span>/{{ Number(denominator) }}</span>