scripts/BlenderImporter/genblenddna.py: return 0 on success

scripts/BlenderImporter/genblenddna.py

@@ -291,7 +291,9 @@ def main():
     #s += "#endif\n"
         
     output.write(templt.replace("<HERE>",s))
-        
+
+    # we got here, so no error
+    return 0
 
 if __name__ == "__main__":
     sys.exit(main())