Check that debian script was installed

src/freedombone-image

             makepkg -i --force --noconfirm
             sudo wget https://raw.githubusercontent.com/bashrc/freedombone/stockholm/image_build/debootstrap/scripts/${DEBIAN_VERSION} -O /usr/share/debootstrap/scripts/debscript
             sudo cp -f /usr/share/debootstrap/scripts/debscript /usr/share/debootstrap/scripts/${DEBIAN_VERSION}
+            if [ ! -f /usr/share/debootstrap/scripts/${DEBIAN_VERSION} ]; then
+                echo $"No debian dbootstrap script was found for $DEBIAN_VERSION"
+                return
+            fi
             ;;
         *)
             echo $'Unkown operating system'