Panic occured if no txtable was found in last eraseblock of MTD device and `CONFIG_TXTABLE_DEFAULT_PARTITION` was disabled
Backtrace
sched_dumpstack
/workspace/nuttx/libs/libc/sched/sched_dumpstack.c:71
dump_assert_info
/workspace/nuttx/sched/misc/assert.c:718
xtensa_user_panic
/workspace/nuttx/arch/xtensa/src/common/xtensa_assert.c:188 (discriminator 1)
xtensa_user
??:?
_xtensa_user_handler
/workspace/nuttx/arch/xtensa/src/common/xtensa_user_handler.S:194
??
??:0
parse_txtable_partition
/workspace/nuttx/fs/partition/fs_txtable.c:136
parse_partition
/workspace/nuttx/fs/partition/fs_partition.c:165
parse_mtd_partition
/workspace/nuttx/fs/partition/fs_partition.c:291
Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>