Empty JSON should cause an exception, according to the grammar

[ssilverman]

jsonp-test-suite/src/main/java/org/leadpony/jsonp/testsuite/tests/AbstractJsonParserTest.java

Lines 118 to 119 in 5efa996

	EMPTY("", 0, false),
	BLANK(" ", 0, false);

According to the JSON grammar, there needs to be at least one thing, be it an object, value, or array. Shouldn't a parsing exception (EOF) be thrown for these? hasNext(), in addition to next(), throws a JsonParsingException when it advances to the next event, and since the parser encounters an EOF before the next event, it's technically invalid JSON.

Ref: https://tools.ietf.org/html/rfc8259#section-2

JSON-text = ws value ws

[leadpony]

@ssilverman
I will check it.