OffsetArray of size 1 from elementwise multiplication

[liamh]

See forum discussion with examples.

When I elementwise multiply an offset array by a regular array, I get the result I expect - the resulting array is offset properly - except when the size is 1. When the input array dimension is 6:10, for example, the multiplication result is 6:10 in the first dimension. This is as I expect, and all dimensions of size greater than 1 result in the same first dimension as the input. However, when the input array is 10:10, the multiplication result is 1:1 in the first dimension. I expect 10:10 as the first dimension, consistent with the size > 1 case.