_reshape_and_preserve_tags: support untaggable arrays

[matthiasdiener]

(e.g. np.ndarray)

cc inducer/arraycontext#235

[inducer]

I'm not sure why that'd be necessary. For arrays that don't do tagging, wouldn't actx.tag be a no-op?

[matthiasdiener]

I'm not sure why that'd be necessary. For arrays that don't do tagging, wouldn't actx.tag be a no-op?

actx.tag() is a no-op in inducer/arraycontext#235, but ary.tags won't work (since ary is an ndarray in that case).

[inducer]

actx.tag is a no-op in inducer/arraycontext#235, but ary.tags won't work (since ary is an ndarray in that case).

That makes sense. But in that case, only the access ary.tags should be in the try block.

[matthiasdiener]

That makes sense. But in that case, only the access ary.tags should be in the try block.

What do you think of 50f3134?

[inducer]

LGTM, thanks!