Query to endpoint `/package` returns sometimes `version` property with string value of `undef`

[jackdeguest]

When issuing a query to the endpoint /v1/package?q=HTTP, this returns some results, including one set for the package (for example), Test::HTTP::Syntax, or Protocol::HTTP::Message, or Protocol::HTTP::Request whose dataset property version has a string value, in JSON, of undef. I think this was meant to be null so that it translates in Perl as undef.

Below is the JSON output:

{
   "hits" : {
      "hits" : [
         {
            "_score" : 2.6572695,
            "_type" : "package",
            "_index" : "cpan_v1_01",
            "_source" : {
               "version" : "0.22",
               "file" : "M/MM/MML/Test-HTTP/Test-HTTP-0.22.tar.gz",
               "author" : "MML",
               "distribution" : "Test-HTTP",
               "dist_version" : "0.22",
               "module_name" : "Test::HTTP"
            },
            "_id" : "Test::HTTP"
         },
         {
            "_source" : {
               "module_name" : "HTTP::AnyUA::Backend::HTTP::AnyUA",
               "distribution" : "HTTP-AnyUA",
               "dist_version" : "0.904",
               "file" : "C/CC/CCM/HTTP-AnyUA-0.904.tar.gz",
               "author" : "CCM",
               "version" : "0.904"
            },
            "_type" : "package",
            "_index" : "cpan_v1_01",
            "_score" : 2.3152514,
            "_id" : "HTTP::AnyUA::Backend::HTTP::AnyUA"
         },
         {
            "_id" : "HTTP::AnyUA::Backend::AnyEvent::HTTP",
            "_score" : 2.301661,
            "_source" : {
               "author" : "CCM",
               "file" : "C/CC/CCM/HTTP-AnyUA-0.904.tar.gz",
               "version" : "0.904",
               "distribution" : "HTTP-AnyUA",
               "dist_version" : "0.904",
               "module_name" : "HTTP::AnyUA::Backend::AnyEvent::HTTP"
            },
            "_index" : "cpan_v1_01",
            "_type" : "package"
         },
         {
            "_id" : "HTTP::AnyUA::Backend::HTTP::Tiny",
            "_type" : "package",
            "_index" : "cpan_v1_01",
            "_source" : {
               "module_name" : "HTTP::AnyUA::Backend::HTTP::Tiny",
               "distribution" : "HTTP-AnyUA",
               "dist_version" : "0.904",
               "file" : "C/CC/CCM/HTTP-AnyUA-0.904.tar.gz",
               "version" : "0.904",
               "author" : "CCM"
            },
            "_score" : 2.301661
         },
         {
            "_score" : 2.301661,
            "_source" : {
               "module_name" : "Test::HTTP::Syntax",
               "distribution" : "Test-HTTP",
               "dist_version" : "0.22",
               "file" : "M/MM/MML/Test-HTTP/Test-HTTP-0.22.tar.gz",
               "version" : "undef",
               "author" : "MML"
            },
            "_type" : "package",
            "_index" : "cpan_v1_01",
            "_id" : "Test::HTTP::Syntax"
         },
         {
            "_score" : 2.3012629,
            "_source" : {
               "version" : "1.023",
               "author" : "AKALINUX",
               "file" : "A/AK/AKALINUX/HTTP-MultiGet-1.023.tar.gz",
               "distribution" : "HTTP-MultiGet",
               "dist_version" : "1.023",
               "module_name" : "HTTP::MultiGet"
            },
            "_type" : "package",
            "_index" : "cpan_v1_01",
            "_id" : "HTTP::MultiGet"
         },
         {
            "_id" : "HTTP::MultiGet::Role",
            "_source" : {
               "author" : "AKALINUX",
               "version" : "undef",
               "file" : "A/AK/AKALINUX/HTTP-MultiGet-1.023.tar.gz",
               "dist_version" : "1.023",
               "distribution" : "HTTP-MultiGet",
               "module_name" : "HTTP::MultiGet::Role"
            },
            "_index" : "cpan_v1_01",
            "_type" : "package",
            "_score" : 2.3012629
         },
         {
            "_id" : "Protocol::HTTP",
            "_index" : "cpan_v1_01",
            "_type" : "package",
            "_source" : {
               "module_name" : "Protocol::HTTP",
               "author" : "SYBER",
               "file" : "S/SY/SYBER/Protocol-HTTP-1.1.5.tar.gz",
               "version" : "1.001005",
               "dist_version" : "1.1.5",
               "distribution" : "Protocol-HTTP"
            },
            "_score" : 2.3012629
         },
         {
            "_id" : "Protocol::HTTP::Message",
            "_type" : "package",
            "_index" : "cpan_v1_01",
            "_source" : {
               "file" : "S/SY/SYBER/Protocol-HTTP-1.1.5.tar.gz",
               "version" : "undef",
               "author" : "SYBER",
               "dist_version" : "1.1.5",
               "distribution" : "Protocol-HTTP",
               "module_name" : "Protocol::HTTP::Message"
            },
            "_score" : 2.3012629
         },
         {
            "_id" : "Protocol::HTTP::Request",
            "_source" : {
               "distribution" : "Protocol-HTTP",
               "dist_version" : "1.1.5",
               "file" : "S/SY/SYBER/Protocol-HTTP-1.1.5.tar.gz",
               "author" : "SYBER",
               "version" : "undef",
               "module_name" : "Protocol::HTTP::Request"
            },
            "_type" : "package",
            "_index" : "cpan_v1_01",
            "_score" : 2.3012629
         }
      ],
      "max_score" : 2.6572695,
      "total" : 1671
   },
   "_shards" : {
      "failed" : 0,
      "total" : 3,
      "successful" : 3
   },
   "timed_out" : false,
   "took" : 6
}