From cccf6a5b85359ede9bafa8d05fe302be8f4dcf78 Mon Sep 17 00:00:00 2001
From: Konrad Malawski <ktoso@project13.pl>
Date: Thu, 8 Oct 2015 12:00:09 +0200
Subject: [PATCH] +doc #18670 log errors when included snippet empty

Forward port of #18670
---
 akka-docs/_sphinx/exts/includecode.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/akka-docs/_sphinx/exts/includecode.py b/akka-docs/_sphinx/exts/includecode.py
index 7ea125f6ed..af5684e786 100644
--- a/akka-docs/_sphinx/exts/includecode.py
+++ b/akka-docs/_sphinx/exts/includecode.py
@@ -109,6 +109,11 @@ class IncludeCode(Directive):
                     return count
 
         nonempty = filter(lambda l: l.strip(), lines)
+        if not nonempty:
+            return [document.reporter.error(
+                "Snippet ({}#{}) not found!".format(filename, section),
+                line=self.lineno
+            )]
         tabcounts = map(lambda l: countwhile(lambda c: c == ' ', l), nonempty)
         tabshift = min(tabcounts) if tabcounts else 0