Handle missing subsegment when rendering a Django template (#54)

Author: garyd203

aws_xray_sdk/ext/django/templates.py

@@ -23,7 +23,8 @@ def xray_render(self, context):
         if template_name:
             name = str(template_name)
             subsegment = xray_recorder.current_subsegment()
-            subsegment.name = name
+            if subsegment:
+                subsegment.name = name
 
         return Template._xray_original_render(self, context)