[tlmgr] Use of uninitialized value $founddesc

[Yukai Chou]

Hi,

Today after I mistakenly ran "tlmgr info mnsymbols" (the package name
should be "mnsymbol", no trailing "s"), I got

$ tlmgr info mnsymbols
tlmgr: cannot find package mnsymbols, searching for other matches:


Packages containing `mnsymbols' in their title/description:
Use of uninitialized value $founddesc in print at /Library/TeX/texbin/tlmgr
line 4333.


Packages containing files matching `mnsymbols':
HASH(0x7fb4be47f750)%


>From relevant lines in tlmgr.pl [1], it seems some guards are needed in
show_one_package_detail().

## lines 4329 to 4335
      # we didn't find a package like this, so use search
      info("$prg: cannot find package $pkg, searching for other
matches:\n");
      my ($foundfile, $founddesc) = search_tlpdb($remotetlpdb,$pkg,1,1,0);
      print "\nPackages containing \`$pkg\' in their title/description:\n";
      print $founddesc;
      print "\nPackages containing files matching \`$pkg\':\n";
      print $foundfile;


[1]
https://github.com/TeX-Live/texlive-source/blob/e0c96545fbb68f09ef7ebee4c16b6cb76f6e8019/texk/texlive/linked_scripts/texlive/tlmgr.pl#L4329-L4335

best regards,
Yukai
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