I might have been a touch confused as to what you were asking. Adding this

  elsif(ref($ref) eq '') { 
      $sub1->('',''); 
      print 'undef'; 
      } # scalar
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before

if ($lastc){
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prints all scalars as undef.

$hash={1AoH=>[{h1=>{a=>undef}
              },
              {h2=>{a=>undef}
              },
              {h3=>{a=>undef}
              }
             ],
       2Aoa=>[[undef,
               undef,
               undef
              ],
              [undef,
               undef,
               undef
              ]
             ],
       3AoAoH=>[[{2=>undef,
                  a=>undef
                 },
                 {2=>undef,
                  a=>undef
                 },
                 {axx=>{a=>undef}
                 }
                ]
               ],
       4HoHoA=>{a11=>[{h111=>{a=>undef}
                      },
                      {h211=>{a=>undef}
                      },
                      {h311=>{a=>undef}
                      },
                      undef
                     ],
                a22=>[{h122=>{a=>undef}
                      },
                      {h222=>{a=>undef}
                      },
                      {h322=>{a=>undef}
                      },
                      undef
                     ]
               },
       5HoH=>{a411=>{h1111=>{a=>undef},
                     h4112=>{h41121=>{a=>undef}
                            },
                     h4113=>{h41131=>{a=>undef}
                            },
                     h4114=>undef
                    },
              a422=>{h422a=>{a4222=>{h42221=>{a=>undef}
                                    },
                             a4223=>{h42231=>{a=>undef}
                                    },
                             h4221=>{a=>undef,
                                     b=>undef
                                    }
                            },
                     h422b=>undef
                    },
              a433=>{a=>undef,
                     b=>undef,
                     c=>undef
                    }
             },
       Clean=>{extra=>{}},
       Domains=>{},
       Lists=>{Body=>{RedactedWordList=>{weight=>undef,
                                         words=>{word1=>undef,
                                                 word2=>undef
                                                },
                                         words_found=>[]
                                        }
                     }
              },
       Words=>{},
       flags=>{Redacted=>undef,
               Redacted2=>undef,
               Redacted3=>undef,
               Redacted4=>undef,
               example=>undef,
               font_attributes=>{colors=>undef,
                                 size=>undef
                                },
               font_changes=>{colors=>undef,
                              size=>undef
                             }
              },
       other_results=>{},
       recipient_list=>[undef],
       removed_results=>[undef,
                         undef,
                         undef
                        ],
       result=>undef
      };
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