Triggering rendering option "render-superatom-mode" to "collapse" causes crash

While attempting to render a molecule that contains superatoms to a PNG file, I am receiving a Segmentation fault: 11. This only occurs when the code `indigo.setOption("render-superatom-mode", "collapse")` is called. When the option is in the expanded mode, the PNG is written out just fine. Below is my code and attached is my mol file and the correctly expanded PNG of the molecule. I am using Python 2.7, Indigo version 1.3.0beta.r16-universal, and OSX 10.11.4.

```
from indigo import (indigo,
indigo_renderer)

IN_MOL = 'sgroups.mol'
OUT_PNG = 'sgroups.png'

indigo = indigo.Indigo()
renderer = indigo_renderer.IndigoRenderer(indigo)

mol = indigo.loadMoleculeFromFile(IN_MOL)
print "mol weight: " + str(mol.molecularWeight())

indigo.setOption("render-output-format","png")
indigo.setOption("render-superatom-mode", "collapse") #<-- causes crash
indigo.setOption("render-margins",50,50)
mol.layout()

renderer.renderToFile(mol, OUT_PNG)
```

Note: I found a similar issue posted a few years ago.
[Issue Link](https://groups.google.com/d/msg/indigo-general/eIfbSSAlFM4/uBhKgt2fY_MJ)


```

-INDIGO-02091713402D

20 22 0 0 0 0 0 0 0 0999 V2000
-6.9282 0.8000 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
-5.5426 0.0000 0.0000 N 0 0 0 0 0 0 0 0 0 0 0 0
-4.1569 0.8000 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
-2.7713 0.0000 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
-1.3856 0.8000 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
0.0000 0.0000 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
1.3220 0.9013 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
0.9659 2.4612 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
2.1388 3.5495 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
3.6677 3.0779 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
4.0238 1.5180 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
2.8509 0.4297 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
3.4354 -1.0597 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
2.6354 -2.4453 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
1.0533 -2.6838 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
0.6973 -4.2437 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
-0.8316 -4.7153 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
-2.0045 -3.6270 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
-1.6485 -2.0671 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
-0.1196 -1.5955 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
1 2 1 0 0 0 0
2 3 1 0 0 0 0
3 4 1 0 0 0 0
4 5 1 0 0 0 0
5 6 2 0 0 0 0
6 7 1 0 0 0 0
7 8 2 0 0 0 0
8 9 1 0 0 0 0
9 10 2 0 0 0 0
10 11 1 0 0 0 0
11 12 2 0 0 0 0
12 7 1 0 0 0 0
12 13 1 0 0 0 0
13 14 1 0 0 0 0
14 15 1 0 0 0 0
15 16 2 0 0 0 0
16 17 1 0 0 0 0
17 18 2 0 0 0 0
18 19 1 0 0 0 0
19 20 2 0 0 0 0
20 6 1 0 0 0 0
20 15 1 0 0 0 0
M STY 2 1 SUP 2 SUP
M SLB 2 1 1 2 2
M SAL 1 2 2 1
M SBL 1 1 2
M SMT 1 MeN
M SAL 2 2 3 4
M SBL 2 2 2 4
M SMT 2 H4C2
M END
```