queries: Fix panic from syntax error at the end of a query file

`line_end` could be the last byte in the file so `line_end + 1` could
cause a panic. We can be defensive and use `str::get` instead.

Author: the-mikedavis

bindings/src/query.rs

@@ -375,9 +375,9 @@ impl ParserErrorLocation {
                     .next_back()
                     .filter(|s| !s.is_empty())
                     .map(ToOwned::to_owned);
-                line_after = source[line_end + 1..]
-                    .lines()
-                    .next()
+                line_after = source
+                    .get(line_end + 1..)
+                    .and_then(|rest| rest.lines().next())
                     .filter(|s| !s.is_empty())
                     .map(ToOwned::to_owned);
                 break;