check for existence of opkg_commands-file

.githooks/post-checkout

@@ -27,6 +27,7 @@ write_log_file () {
             echo "DOWNLOAD, /etc/psa_config/DC2C_print29.json, $now, N/A" >> $GIT_UPDATE_LOG
             echo "DOWNLOAD, /etc/psa_config/DC2C_print32.json, $now, N/A" >> $GIT_UPDATE_LOG
             if grep -qE . "${OPKG_COMMANDS_FILE}"; then
+                if [ -f "$OPKG_COMMANDS_FILE" ]; then
                     readarray opkg_commands < <(cat $OPKG_COMMANDS_FILE)
                     for opkg_c in "${opkg_commands[@]}"; do
                         # check for lines longer than 'opkg '
@@ -38,6 +39,7 @@ write_log_file () {
                         fi
                     done
                 fi
+            fi
         else
             echo "Found existing line: $line. Do nothing"
         fi