Avoiding 'zero' values in a DAX when you have multiple selected in a filter

Let's say I want to show a bar graph showing Year on Year gross profit for stores broken down into speciic products.

Here's an example of some data I have for three stores. Let's say they sell chainsaws (among other things):

I have used the following logic to create this... Which works in almost every situation other than the bar graph:

Note that due to a way in which I've created a weekly/monthly subset, I need the 'previous year' value to be in the source data, not calculated using 'sameperiodlastyear...

Gross Profit = caulculate(sum(TABLE[Gross Profit This year]), unrelated conditions..)
Gross Profit Last year = caulculate(sum(TABLE[Gross Profit Last year]), unrelated conditions..)

Gross Profit YoY= = SWITCH(TRUE(),
[Gross Profit Last Year] = 0, BLANK(),
[Gross Profit Last Year] <> 0, calculate(([Gross Profit] -[Gross Profit Last Year]) / [Gross Profit Last Year]))

In my bar graph, I've set the visual filter to not show blank YoY (as not doing this causes the bars to ALL go blank).

Here's what I want if I Click Slicer = Store 1, Store 2, Store 3

This is what I get. 

I thought that my DAX code would have caused the YOY value for Stores 1 and 3 to go blank for Chainsaws, but it seems to still include them because store 2 has a value. 

I just want store 2's YoY to show, BUT I want to keep the multi-select functionality, because all stores may have sold batteries and bikes still. Any tips from within Power BI?

Note: I'd rather do it in PBI than adding a YoY column in SQL where possible - It's doable as a last resort but I anticipate some other aspects of the dashboard needing things to be done at a PBI level.