guard against nil span when calculating offset
#388
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Given a date range of the format "%d %b %Y to %d %b %Y" such as "01 Jan 1988 to 31 Dec 1999" chronic will throw the error
NoMethodError (undefined method '+' for nil:NilClass). This happens because getting the anchor won't work for some weirder date formats and just returns nil, that in turn gets passed to the offset method.It looks like it could probably happen with other repeaters as well, but I was unable to craft a string of sufficient silliness to cause it to happen in other repeaters.
Now, instead of throwing an error, Chronic.parse will just return nil, which is consistent with the documentation.