[Rpm-maint] [rpm-software-management/rpm] `%{gsub:...}` throws error (Issue #3410)

[Vít Ondruch]

>From [documentation](https://github.com/rpm-software-management/rpm/blob/ebc406862053815528c00095f9f991d649fa33a0/docs/manual/macros.md?plain=1#L119), I would think this should work:

~~~
$ rpm --eval "%{gsub:foo o i}"
error: lua script failed: [string "gsub"]:1: bad argument #2 to 'gsub' (string expected, got no value)
~~~

Please note the example works just fine without the collon:

~~~
$ rpm --eval "%{gsub foo o i}"
fii
~~~

Testing on Fedora Rawhide:

~~~
$ rpm -q rpm
rpm-4.20.0-1.fc42.x86_64
~~~

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