Allow for null/all-whitespace C-L fields as we did pre-1.3.26. However,

we do not allow for the total bogusness of values for C-L, just this
one special case. IMO a C-L field of "iloveyou" is bogus as is one
of "123yabbadabbado", which older versions appear to have allowed
(and in the 1st case, assume 0 and in the 2nd assume 123). Didn't
make sense to make this runtime, but a documented special case
instead.
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@95986 13f79535-47bb-0310-9956-ffa450edef68