Fails after checking if a brew installed

[jerkmcjerkface]

I'm having a weird issue, when running ./linuxify install, it immediately exits when it gets to a package that isn't installed:

 bash -x linuxify install                                                        
+ set -euo pipefail
++ sysctl -a
++ /usr/bin/awk '/machdep.cpu.brand_string/{print $2}'
+ export 'CPU_BRAND_STRING=Intel(R)'
+ CPU_BRAND_STRING='Intel(R)'
+ linuxify_formulas=("watch" "wget" "wdiff" "autoconf" "coreutils" "binutils" "diffutils" "ed" "findutils" "gawk" "gnu-indent" "gnu-sed" "gnu-tar" "gnu-which" "grep" "gzip" "screen" "bash" "emacs" "gpatch" "less" "m4" "make" "nano" "bison" "flex" "libressl" "file-formula" "git" "openssh" "perl" "python" "rsync" "unzip" "vim")
+ linuxify_main install
+ '[' 1 -eq 1 ']'
+ case $1 in
+ linuxify_install
+ linuxify_check_os
+ [[ darwin19 =~ darwin* ]]
+ linuxify_check_brew
+ command -v brew
+ linuxify_set_prefix
++ brew --prefix
+ export BREW_PREFIX=/usr/local
+ BREW_PREFIX=/usr/local
+ linuxify_check_dirs
+ result=0
+ for dir in '${BREW_PREFIX}/bin' '${BREW_PREFIX}/sbin'
+ [[ ! -d /usr/local/bin ]]
+ [[ ! -w /usr/local/bin ]]
+ for dir in '${BREW_PREFIX}/bin' '${BREW_PREFIX}/sbin'
+ [[ ! -d /usr/local/sbin ]]
+ [[ ! -w /usr/local/sbin ]]
+ return 0
+ (( i=0 ))
+ (( i<35 ))
++ brew ls --versions watch
+ INSTALLED='watch 3.3.17'
+ [[ -n watch 3.3.17 ]]
+ echo 'Found Existing watch - watch 3.3.17'
Found Existing watch - watch 3.3.17
+ (( i++  ))
+ (( i<35 ))
++ brew ls --versions wget
+ INSTALLED='wget 1.21.1'
+ [[ -n wget 1.21.1 ]]
+ echo 'Found Existing wget - wget 1.21.1'
Found Existing wget - wget 1.21.1
+ (( i++  ))
+ (( i<35 ))
++ brew ls --versions wdiff
+ INSTALLED='wdiff 1.2.2_2'
+ [[ -n wdiff 1.2.2_2 ]]
+ echo 'Found Existing wdiff - wdiff 1.2.2_2'
Found Existing wdiff - wdiff 1.2.2_2
+ (( i++  ))
+ (( i<35 ))
++ brew ls --versions autoconf
+ INSTALLED=
~/Development/linuxify master >

It just returns to the prompt, something about this test returning blank makes it bail out:

      INSTALLED=$(brew ls --versions ${linuxify_formulas[i]})
        if [[ -n $INSTALLED ]]; then
            echo "Found Existing ${linuxify_formulas[i]} - ${INSTALLED}"
        else
            echo "Installing ${linuxify_formulas[i]}"
            brew install ${linuxify_formulas[i]}
        fi

[Clayton Bodendein]

I ran into the exact same issue earlier this week.