add_path.sh: Fix reuse the script
if [ -z ${IDF_PATH} ]; then
echo "IDF_PATH must be set before including this script."
else
+ IDF_ADD_PATHS_EXTRAS=
IDF_ADD_PATHS_EXTRAS="${IDF_ADD_PATHS_EXTRAS}:${IDF_PATH}/components/esptool_py/esptool"
IDF_ADD_PATHS_EXTRAS="${IDF_ADD_PATHS_EXTRAS}:${IDF_PATH}/components/espcoredump"
IDF_ADD_PATHS_EXTRAS="${IDF_ADD_PATHS_EXTRAS}:${IDF_PATH}/components/partition_table/"
