how to check if an image exist in a region?

Below codes works if the image exists in the screen but if it is not then i get an error. 
So, I need to know how to check if the image exist before clicking.

Also, the For i code is redundant coz im expecting a single location or return value only - dont know how to do that as well.
Sorry, just starting to code and struggling to understand the command

local RBattle = Region(360, 512, 85,85)

test = listToTable(RBattle:findAll("Battle.png"))

for i, m in ipairs(test) do
    click(m)
end