svn_auth_cred_simple_t crash

Hi,

if i set 'const char *password' in 'svn_auth_cred_simple_t' to 0 subversion
crashes in cram.c compute_digest (called from svn_ra_svn__cram_client) when
running strlen on the password (on 1.1.x branch).

This happens in my (client) code when the user does not enter a password in
the prompt dialog.

The code should check the pointer first.

-- 
Martin
Subcommander, http://subcommander.tigris.org
a x-platform Win32/Unix svn gui (qt) client & a text diff/merge tool.
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