Support for NULL value

[tomasweigenast]

Currently there is no way to pass null as parameters in any method. I know I can specify in the query the NULL value as a raw string, but I need the ability to create generic insert method for example, an pass in a Map, if a value is null, it should be converted

[simolus3]

Passing null parameters should work and is tested:

sqlite3.dart/sqlite3/test/common/prepared_statement.dart

Lines 99 to 101 in 6e6e0b3

	test('can bind null blob in prepared statements', () {
	expect(insertBlob(null), isNull);
	});

You can pass a List containing null to all methods accepting parameters. Could you provide more details about what isn't working for you?