update check_ccache.sh

ci/scripts/check_ccache.sh

@@ -57,7 +57,7 @@ do
     fi
 done
 
-if [[ ${BRANCH_NAME} =~ "PR-" && ! -n ${CHANGE_BRANCH} ]];then
+if [[ -n "${CHANGE_BRANCH}" && "${BRANCH_NAME}" =~ "PR-" ]];then
     echo "fetching ${CHANGE_BRANCH}/ccache-${OS_NAME}-${CODE_NAME}-${BUILD_ENV_DOCKER_IMAGE_ID}.tar.gz"
     wget -q --method HEAD "${ARTIFACTORY_URL}/${CHANGE_BRANCH}/ccache-${OS_NAME}-${CODE_NAME}-${BUILD_ENV_DOCKER_IMAGE_ID}.tar.gz"
     if [[ $? == 0 ]];then