do not apply patches, if there is no

build.sh

@@ -143,7 +143,7 @@ popd > /dev/null #${SITE_DIR}
 ### APPLY PATCHES TO GLUON
 progress "Applying Patches ..."
 git checkout -B patching "${BASE}"
-if [ "$(echo "${PATCH_DIR}"/*.patch)" ]; then
+if [ -d "${PATCH_DIR}" -a "$(echo ${PATCH_DIR}/*.patch)" ]; then
 	git am ${PATCH_DIR}/*.patch || (
 		git am --abort
 		git checkout patched