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Fix YAML JSON Schema files starting with %YAML 1.x

Fix a bug where YAML files containing a JSON Schema that start with
%YAML 1.x or a comment that contains a number would fail to to be parsed.

This is caused by the fact that the JSON Schema parser would contain the
number, e.g. 1.2 as the value of `unresolvedJsonSchema.schema` and so
the test for `=== undefined` would fail. This would cause the error from
the JSON parser to be returned instead of trying to parse the file as a
YAML file.

To work around this, also check if `unresolvedJsonSchema.schema` is a
number. It if is, it clearly was not a JSON Schema and so we can safely
try to parse the file as a YAML file.

Fixes: https://github.com/redhat-developer/yaml-language-server/issues/922
Signed-off-by: David Lechner <dlechner@baylibre.com>

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