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94c0df797e
Details: - Updated level-2 and level-3 internal back-ends so that the operation's _check() function is called BEFORE any attempt to return early due to the presence of zero dimensions. This ordering makes more sense because (for example) object dimensions should match even if one of them is zero. Previously, a dimension mismatch could result in an early return with no error message. - Updated bli_check_object_buffer() so that NULL buffers result in an error only if the object is dimensionally non-empty (i.e., only if both of the object's dimensions are non-zero). This allows BLIS operations to be performed on dimensionally empty objects (i.e., where at least one dimension is zero). - Updated the error message associated with bli_check_object_buffer() to mention the newly relaxed constraint mentioned above, vis-a-vis non-zero dimensions.