Fix 500 error caused by If-Modified-Since=0 HTTP header #1029
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Prior to this commit a 500 error would be bubbled up to the user when the
If-Modified-Since header was passed to the backend with a value of 0.
In this fix, the zero value is explicitly handled (in same way as with a null
value) by returning -1 to the caller.
Issue: SPR-14144