standalone recovery code cannot handle deleted checkpoints

==4055==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 588 byte(s) in 1 object(s) allocated from:

    #0 0x4da810 in malloc (/mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/.libs/wt+0x4da810)

    #1 0x7f9ef16b4f0c in __wt_malloc /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/os_common/os_alloc.c:85:11

    #2 0x7f9ef16b4f0c in __wt_strndup /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/os_common/os_alloc.c:287

    #3 0x7f9ef169f6f1 in __wt_meta_block_metadata /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/meta/meta_ckpt.c:299:2

    #4 0x7f9ef16a0066 in __wt_meta_ckptlist_get /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/meta/meta_ckpt.c:391:3

    #5 0x7f9ef1448b56 in __wt_import /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/btree/bt_import.c:109:2

    #6 0x7f9ef1767478 in __session_import /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/session/session_api.c:1144:2

    #7 0x51828b in util_import /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/utilities/util_import.c:44:13

    #8 0x524199 in main /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/utilities/util_main.c:301:8

    #9 0x7f9ef0319b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310

Direct leak of 40 byte(s) in 1 object(s) allocated from:

    #0 0x4dac90 in realloc (/mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/.libs/wt+0x4dac90)

    #1 0x7f9ef16b4452 in __realloc_func /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/os_common/os_alloc.c:130:11

    #2 0x7f9ef17aee2d in __wt_buf_grow_worker /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/support/scratch.c:49:4

    #3 0x7f9ef1448c53 in __wt_buf_grow /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/include/buf.i:18:6

    #4 0x7f9ef1448c53 in __wt_buf_set /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/include/buf.i:85

    #5 0x7f9ef1448c53 in __wt_import /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/btree/bt_import.c:113

    #6 0x7f9ef1767478 in __session_import /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/session/session_api.c:1144:2

    #7 0x51828b in util_import /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/utilities/util_import.c:44:13

    #8 0x524199 in main /mnt/data0/jenkins/workspace/wiredtiger-clang-sanitizer/build_posix/../src/utilities/util_main.c:301:8

    #9 0x7f9ef0319b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310