Add NOOP after and before quote if there is no labeled vnodes

[zurk]

I mention that when you have a string var t = "asd";and parse it into a sequence of vnodes you get

VirtualNode('', y=∅, start=(0, 1, 1), end=(0, 1, 1), node=None, path="test.py"),
VirtualNode('var', y=None, start=(0, 1, 1), end=(3, 1, 4), node=None, path="test.py"),
VirtualNode(' ', y=␣, start=(3, 1, 4), end=(4, 1, 5), node=None, path="test.py"),
VirtualNode('t', y=None, start=(4, 1, 5), end=(5, 1, 6), node=140603951547032, path="test.py"),
VirtualNode(' ', y=␣, start=(5, 1, 6), end=(6, 1, 7), node=None, path="test.py"),
VirtualNode('=', y=None, start=(6, 1, 7), end=(7, 1, 8), node=None, path="test.py"),
VirtualNode(' ', y=␣, start=(7, 1, 8), end=(8, 1, 9), node=None, path="test.py"),
VirtualNode('"', y=", start=(8, 1, 9), end=(9, 1, 10), node=None, path="test.py"),
VirtualNode('asd', y=None, start=(9, 1, 10), end=(12, 1, 13), node=140603951547120, path="test.py"),
VirtualNode('"', y=", start=(12, 1, 13), end=(13, 1, 14), node=None, path="test.py"),
VirtualNode(';', y=None, start=(13, 1, 14), end=(14, 1, 15), node=None, path="test.py"),
VirtualNode('', y=∅, start=(14, 1, 15), end=(14, 1, 15), node=None, path="test.py")

And if you want to insert space between last " and ; you cannot because there is no NOOP from parser.