Fix defect empty animation parameter name at the 1D animations.

I think accessor's parameter needs parameter name.

Below is part of the collada_spec_1_4.pdf (P.38) accessor's details.

> The number and order of <param> elements define the output of the <accessor> element. Parameters
are bound to values in the order in which both are specified. No reordering of the data can occur. A
<param> element without a name attribute indicates that the value is not part of the output, so the element
is unbound.