[BUG] Alias reversing breaks everything when 0 aliases exist

[theryangeary]

sed: 1: "s|\<_|g; ": unterminated substitute in regular expression
entries=1, file=/home/vagrant/.bash_history, char==, len=115
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 ================================================================================================================  1
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-bash-5.0$ alias
-bash-5.0$ echo "alias t='echo Hello'" >> ~/.bashrc
-bash-5.0$ source .bashrc
-bash: .bashrc: No such file or directory
-bash-5.0$ source ~/.bashrc
-bash-5.0$ t
Hello
-bash-5.0$ t
Hello
-bash-5.0$ t
Hello
-bash-5.0$ t
Hello
-bash-5.0$ t
Hello
-bash-5.0$ history -a
-bash-5.0$ ./ginh.sh 
entries=6, file=/home/vagrant/.bash_history, char==, len=115
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      git ======================================================================================================  11
     echo ========================================================  6
./ginh.sh ==============================================  5
  history ============================  3
       cd ==========  1
    alias ==========  1
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-bash-5.0$