[FS#795] opkg refuses to install package with unset arch

[LEDE Bugs]

The following task has a new comment added:

FS#795 - opkg refuses to install package with unset arch
User who did this - Bastian Bittorf (bittorf)

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It works, when "all" is specified, but not when unspecified. This was working "when i was young". So IMHO null => all
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=795#comment2657