Unable to generate Rendering of InchiString using python API

**Steps to Reproduce**
1. Use Indigo library (1.7.4). In python 3.9
2. The following code was run

```
from indigo import Indigo
from indigo.renderer import IndigoRenderer
from indigo.inchi import IndigoInchi

indigo_object = Indigo()

mol1 = indigo_object.loadMolecule("ONc1cccc1")

print(mol1.smiles())

indigo_renderer_object = IndigoRenderer(indigo_object)

indigo_renderer_object.renderToFile(mol1, "mol1.png")

# From inchi string:

# mol2 = indigo_object.loadMolecule("InChI=1S/C6H12O6/c1-2-4-6-5-3-1/h1-6H")

# indigo_renderer_object.renderToFile(mol2, "mol2.png")

indigo_inchi_object = IndigoInchi(indigo_object)

inchi_string = r"InChI=1S/C38H60O18/c1-16-11-37-9-5-20-35(2,7-4-8-36(20,3)34(50)55-32-29(49)26(46)23(43)18(13-40)52-32)21(37)6-10-38(16,15-37)56-33-30(27(47)24(44)19(14-41)53-33)54-31-28(48)25(45)22(42)17(12-39)51-31/h17-33,39-49H,1,4-15H2,2-3H3/t17-,18-,19-,20?,21?,22-,23-,24-,25+,26+,27+,28-,29-,30-,31+,32+,33+,35-,36-,37-,38+/m1/s1_c0"

mol3 = indigo_inchi_object.loadMolecule(inchi_string)

print(indigo_inchi_object.version())
print(indigo_inchi_object.getLog())
print(indigo_inchi_object.getWarning())
print(indigo_inchi_object.getInchiKey(inchi_string))

indigo_renderer_object.renderToFile(mol3, "mol3.png")

imgstring = indigo_renderer_object.renderToString(mol3)

print(imgstring)

```

**Expected behavior**
The expected behavior was that `mol3.png` would have the chemical structure of the design or throw an error indicating that it cannot be computed/rendered.

**Actual behavior**
The program outputs a blank image. Empty PNG with now draings in it. (See first attachment)

**Attachments**
If applicable, add attachment files to reproduce the issue.

**Indigo/Bingo version**
Indigo library (1.7.4) installed from pip

**Additional context**
Add any other context about the problem here.