[Bf-blender-cvs] [9901679ce82] blender2.8: Fix a crash when a driver expression evaluates to NaN.

[Alexander Gavrilov]

Commit: 9901679ce820bb00a3aeecc384fca1a1194d0d87
Author: Alexander Gavrilov
Date:   Sun Sep 16 09:06:21 2018 +0300
Branches: blender2.8
https://developer.blender.org/rB9901679ce820bb00a3aeecc384fca1a1194d0d87

Fix a crash when a driver expression evaluates to NaN.

The debug logging statement was accessing a NULL pointer.
Also happens in 2.79.

===================================================================

M	source/blender/python/intern/bpy_driver.c

===================================================================

diff --git a/source/blender/python/intern/bpy_driver.c b/source/blender/python/intern/bpy_driver.c
index a94708c0602..f1f034c8465 100644
--- a/source/blender/python/intern/bpy_driver.c
+++ b/source/blender/python/intern/bpy_driver.c
@@ -601,7 +601,7 @@ float BPY_driver_exec(struct PathResolvedRNA *anim_rna, ChannelDriver *driver, C
 		return (float)result;
 	}
 	else {
-		fprintf(stderr, "\tBPY_driver_eval() - driver '%s' evaluates to '%f'\n", dvar->name, result);
+		fprintf(stderr, "\tBPY_driver_eval() - driver '%s' evaluates to '%f'\n", driver->expression, result);
 		return 0.0f;
 	}
 }