zilla crash while using model-json and schema is not found

[ankitk-me]

Fixes #817

[jfallows]

Try to avoid using else clauses to assign boolean variables like this.

Instead, aim to take an approach that would also work for multiple conditions discovered incrementally.

Suggested change

	if (provider != null)
	{
	in.wrap(buffer, index, length);
	provider.createReader(in).readValue();
	}
	else
	{
	status = false;
	}
	status &= provider != null;
	if (status)
	{
	in.wrap(buffer, index, length);
	provider.createReader(in).readValue();
	}

[jfallows]

Suggested change

	if (provider != null)
	{
	parser.next();
	parser = provider.createParser(in);
	while (parser.hasNext())
	{
	parser.next();
	}
	}
	else
	{
	status = false;
	status &= provider != null;
	if (status)
	{
	in.wrap(buffer, index, length);
	provider.createReader(in).readValue();
	}