compare broken where the first array cells are zeros

The "maximum absolute relative difference" is displayed as 0 instead of 'inf' and all cells are colored white, which makes it very misleading.

On the other hand "differences only" sees those differences just fine.

arr1 = ndtest((2, 3))
arr2 = arr1.copy()
arr2['a0', 'b0'] = 42
compare(arr1, arr2)

In the session comparator, the array is colored red as it should though:

s1 = Session(arr1=arr1)
s2 = Session(arr1=arr2)
compare(s1, s2)

This only occured when all the cells with differences were 0 in array 0 (because in that case the minimum relative diff was 0)

FIX: fixed compare showing all cells white and 0 as maximum diff when…

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