scripts/get_default_envs.sh: Remove blank lines

After sorting, unnoticed blank lines at the end move to the top.
Avoid this by removing it before sorting.
Signed-off-by: NChristoph Niedermaier <cniedermaier@dh-electronics.com>
Cc: Lukasz Majewski <lukma@denx.de>
Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Cc: Tom Rini <trini@konsulko.com>
To: u-boot@lists.denx.de

scripts/get_default_envs.sh

@@ -35,8 +35,8 @@ cp ${env_obj_file_path} ${ENV_OBJ_FILE_COPY}
 ${OBJCOPY} --dump-section .rodata.default_environment=${ENV_OBJ_FILE_COPY} \
 	${env_obj_file_path}
 
-# Replace default '\0' with '\n' and sort entries
-tr '\0' '\n' < ${ENV_OBJ_FILE_COPY} | sort --field-separator== -k1,1 --stable
+# Replace default '\0' with '\n' , remove blank lines and sort entries
+tr '\0' '\n' < ${ENV_OBJ_FILE_COPY} | sed -e '/^\s*$/d' | sort --field-separator== -k1,1 --stable
 
 rm ${ENV_OBJ_FILE_COPY}