[Rpm-maint] [rpm-software-management/rpm] lua: rpm.glob() returns the supplied pattern if nothing matches (Issue #3794)

[Paul Bolle]

pebolle created an issue (rpm-software-management/rpm#3794)

**Describe the bug**
lua: rpm.glob() returns the supplied pattern if nothing matches. As a consequence it can be hard to distinguish failure and success. Moreover, the documentation states: "If flags contains "c", return the original pattern in case of no matches." But thid also happens when no flags are specified.

**To Reproduce**
$ ls bogus
ls: cannot access 'bogus': No such file or directory
$ rpmlua -e 'print( rpm.glob("bogus")[1] )'
bogus

**Expected behavior**
$ rpmlua -e 'print( rpm.glob("bogus")[1] )'
nil

(Or false or an empty string, or whatever is luaish.)

**Environment**
 - OS / Distribution: Fedora 42
 - Version: rpm-4.20.1

**Additional context**
Today was my first day of dabbling with lua. Did I miss something obvious?

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