prepareMolForDrawing() incorrectly adds chiral Hs if no ring info is present

[greglandrum]

Configuration:

• RDKit Version: all

Description:

In [11]: m = Chem.MolFromSmiles('C[C@H](F)Cl')

In [12]: Draw.PrepareMolForDrawing(m).Debug()
Atoms:
	0 6 C chg: 0  deg: 1 exp: 1 imp: 3 hyb: 4 arom?: 0 chi: 0
	1 6 C chg: 0  deg: 3 exp: 4 imp: 0 hyb: 4 arom?: 0 chi: 2
	2 9 F chg: 0  deg: 1 exp: 1 imp: 0 hyb: 4 arom?: 0 chi: 0
	3 17 Cl chg: 0  deg: 1 exp: 1 imp: 0 hyb: 4 arom?: 0 chi: 0
Bonds:
	0 1->0 order: 1 dir: 1 conj?: 0 aromatic?: 0
	1 1->2 order: 1 conj?: 0 aromatic?: 0
	2 1->3 order: 1 conj?: 0 aromatic?: 0

In [13]: m2 = Chem.MolFromSmiles('C[C@H](F)Cl',sanitize=False)

In [14]: m2.UpdatePropertyCache()

In [15]: Draw.PrepareMolForDrawing(m2).Debug()
Atoms:
	0 6 C chg: 0  deg: 1 exp: 1 imp: 3 hyb: 0 arom?: 0 chi: 0
	1 6 C chg: 0  deg: 4 exp: 4 imp: 0 hyb: 0 arom?: 0 chi: 2
	2 9 F chg: 0  deg: 1 exp: 1 imp: 0 hyb: 0 arom?: 0 chi: 0
	3 17 Cl chg: 0  deg: 1 exp: 1 imp: 0 hyb: 0 arom?: 0 chi: 0
	4 1 H chg: 0  deg: 1 exp: 1 imp: 0 hyb: 0 arom?: 0 chi: 0
Bonds:
	0 0->1 order: 1 conj?: 0 aromatic?: 0
	1 1->2 order: 1 conj?: 0 aromatic?: 0
	2 1->3 order: 1 conj?: 0 aromatic?: 0
	3 1->4 order: 1 dir: 1 conj?: 0 aromatic?: 0

In [16]: 

This is due to the messed up logic in this line of code:
https://github.com/rdkit/rdkit/blob/master/Code/GraphMol/MolDraw2D/MolDraw2DUtils.cpp#L36