taffy view exits with error message if a 0-length interval passed in (instead of crashing)
tai API returns empty iterator if input range not found in index (instead of returning NULL or, in the case of 0-len, crashing). tai_has_next() can check for empty iterator
This makes two changes:
taffy viewexits with error message if a 0-length interval passed in (instead of crashing)taiAPI returns empty iterator if input range not found in index (instead of returningNULLor, in the case of 0-len, crashing).tai_has_next()can check for empty iterator