PyDoc: disable ASAN exit code for doc building

Prevented docs from building on any minor issue when ASAN was enabled.

GNUmakefile

@@ -455,6 +455,7 @@ update: .FORCE
 
 # Simple version of ./doc/python_api/sphinx_doc_gen.sh with no PDF generation.
 doc_py: .FORCE
+	ASAN_OPTIONS=halt_on_error=0 \
 	$(BLENDER_BIN) --background -noaudio --factory-startup \
 		--python doc/python_api/sphinx_doc_gen.py
 	cd doc/python_api ; sphinx-build -b html sphinx-in sphinx-out

doc/python_api/sphinx_doc_gen.sh

@@ -58,7 +58,10 @@ SPHINX_WORKDIR="$(mktemp --directory --suffix=.sphinx)"
 # Generate reStructuredText (blender/python only)
 
 if $DO_EXE_BLENDER ; then
-	# don't delete existing docs, now partial updates are used for quick builds.
+	# Don't delete existing docs, now partial updates are used for quick builds.
+	#
+	# Disable ASAN error halt since it results in nonzero exit code on any minor issue.
+	ASAN_OPTIONS=halt_on_error=0 \
 	$BLENDER_BIN \
 		--background \
 		-noaudio \