Fix reflection getDefaultValue() with user arg info

The default value is part of the op_array in that case, but we have
no way to access it. Fail gracefully.

Fix fetching default value of internal function with userland arginfo

"Fix" in the sense of "not crash". We aren't able to actually
display the default value for this case, as there's no

Fix fetching default value of internal function with userland arginfo

"Fix" in the sense of "not crash". We aren't able to actually
display the default value for this case, as there's no way to
fetch the relevant information right now.

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