[Bug default/21566] New: fedabipkgdiff tool returns "max() arg is an empty sequence" error message in some cases

["sinny at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21566

            Bug ID: 21566
           Summary: fedabipkgdiff tool returns "max() arg is an empty
                    sequence" error message in some cases
           Product: libabigail
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: sinny at redhat dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

Description
------------
Running fedabipkgdiff tool on some packages like python-lxml returns error
message "max() arg is an empty sequence"

Steps to reproduce
-----------------
$ tools/fedabipkgdiff --from fc24 --to fc25 python-lxml
max() arg is an empty sequence

libabigail branch used: master

Expected Result:
----------------
No error message

Additional Information
-----------------------
From fedabipkgdiff source code, at line number 1078
https://sourceware.org/git/gitweb.cgi?p=libabigail.git;a=blob;f=tools/fedabipkgdiff;h=a8329d45763f16c8d4bf93b875040866bc2404f4;hb=HEAD#l1078
, check whether return_codes list is empty or not. If empty 0 should be
returned, otherwise max(return_codes)

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