Fix handling of empty node lists #44
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This PR fixes handling of relative (
@..) and root ($..) queries when used as arguments to filter functions. Previously, when those queries resulted in an empty node list, we were converting that node list to an empty regular list before passing it to functions that accept ValueType arguments. Now, in such cases, we convert empty node lists to the special result Nothing, which is required by the spec and is necessary for correctlength()semantics.We also update the CTS submodule, which now covers this case. See jsonpath-compliance-test-suite #53.