test for syntax errors

.githooks/post-checkout

@@ -30,7 +30,8 @@ if [ -f $CHECKOUT_HISTORY_FILE ]; then
             readarray opkg_commands < <(cat $OPKG_COMMANDS_FILE)
             for opkg_c in "${opkg_commands[@]}"; do
                 # check for empty lines
-                if [ -n "$opkg_c" ]; then
+                if [[ -n $opkg_c ]]; then
+                    echo "CC=$opkg_c"
                     # check if line is not starting with '#'
                     if ! grep -qE "^\s*[#]+.*$" <<< "$opkg_c"; then
                         echo -n "EXECUTE, $opkg_c, $now, N/A" | tr -d '\n\r' >> $GIT_UPDATE_LOG 2>&1