On the fsfs-format7 branch:  always handle NULL checksums when
serializing representations.  There is no point in risking segfaults.

* subversion/libsvn_fs_fs/low_level.h
  (svn_fs_fs__unparse_representation): drop may_be_corrupt parameter

* subversion/libsvn_fs_fs/low_level.c
  (svn_fs_fs__unparse_representation): always test for NULL checksums
  (svn_fs_fs__write_noderev): update caller

* subversion/libsvn_fs_fs/cached_data.c
  (create_rep_state): update caller

* subversion/libsvn_fs_fs/transaction.c
  (store_sha1_rep_mapping): same here


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-format7@1462501 13f79535-47bb-0310-9956-ffa450edef68