Handle generic validation error

[imolorhe]

Currently we don't return validation errors when we don't have valid corresponding pointers. However we wouldn't always have valid pointers e.g. if the data isn't a valid JSON object (see https://github.com/acao/codemirror-json-schema/issues/98)

Here I just pushRoot in those cases. We can consider adding the default root # pointer but the effect will be the same (i.e. by default all entries will at least match the root pointer and so will set the range to the root)

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