Set a variable only to conform with the 'set -u' flag

Amelia.sh

@@ -4028,6 +4028,7 @@ ${purple}###${nc} Chroot & Configure System ${purple}###${nc}
 VANILLA_CONF
 
         if [[ -f /mnt/etc/lightdm/lightdm.conf ]]; then
+
             if [[ "${packages}" == "6" ]]; then
                 arch-chroot /mnt <<-DEEPIN
                 sed -i 's|^#greeter-session=example-gtk-gnome|greeter-session=lightdm-deepin-greeter|g' /etc/lightdm/lightdm.conf
@@ -4082,6 +4083,7 @@ NVIDIAGRUB
         fi
 
         if [[ "${vgaconf}" == "y" && "${vendor}" == "Nvidia" ]]; then
+
             if [[ "${kernelnmbr}" == "1" ]] || [[ "${kernelnmbr}" == "2" && "${family}" == "1" ]] || [[ "${kernelnmbr}" == "2" && "${family}" == "2" && ${nvdriver} == "2" ]]; then
                 arch-chroot /mnt <<-NVIDIAHOOK
                 echo "
@@ -4260,6 +4262,7 @@ NRG
 OPTIMIZED_CONF
 
         if [[ "${vgaconf}" == "y" && "${vendor}" == "Nvidia" ]]; then
+
             if [[ "${kernelnmbr}" == "1" ]] || [[ "${kernelnmbr}" == "2" && "${family}" == "1" ]] || [[ "${kernelnmbr}" == "2" && "${family}" == "2" && ${nvdriver} == "2" ]]; then
                 arch-chroot /mnt <<-NVIDIAHOOK
                 echo "
@@ -4294,6 +4297,7 @@ NVIDIAHOOK
     # NOTE: Custom System Configuration (Add any extra configuration below):
 
     if [[ "${packages}" == "11" ]]; then
+
         arch-chroot /mnt <<-CUSTOM_CONF
         sed -i "/^#${SETLOCALE}/s/^#//" /etc/locale.gen &&
         locale-gen &&
@@ -4377,6 +4381,7 @@ NVIDIAGRUB
         fi
 
         if [[ "${vgaconf}" == "y" && "${vendor}" == "Nvidia" ]]; then
+
             if [[ "${kernelnmbr}" == "1" ]] || [[ "${kernelnmbr}" == "2" && "${family}" == "1" ]] || [[ "${kernelnmbr}" == "2" && "${family}" == "2" && ${nvdriver} == "2" ]]; then
                 arch-chroot /mnt <<-NVIDIAHOOK
                 echo "
@@ -4436,6 +4441,7 @@ NVIDIAHOOK
         revision=""
         greeternmbr=""
         cust_bootopts=""
+        bluetooth=""
 
         clear
         first_check