[libhandy/wip/exalm/dist-script] dist-data: Error out if it can't find docs

[Alexander Mikhaylenko <alexm src gnome org>]

commit 17aa450ba98f97ac0bd7f3b424135ed6898a76f4
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Aug 5 19:10:42 2022 +0400

    dist-data: Error out if it can't find docs
    
    The purpose of that script is to include pre-built docs into the tarball,
    which relies on docs having been manually built beforehand.
    
    This step is easy to miss, so visibly fail instead of continuing with an
    incomplete tarball.

 build-aux/meson/dist-data.py | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/build-aux/meson/dist-data.py b/build-aux/meson/dist-data.py
index 1e5b3db8..3899bd22 100644
--- a/build-aux/meson/dist-data.py
+++ b/build-aux/meson/dist-data.py
@@ -3,6 +3,7 @@
 import os
 import shutil
 import subprocess
+import sys
 
 from pathlib import PurePath
 
@@ -19,3 +20,5 @@ for reference in references:
     if os.path.isdir(src_path):
         dst_path = os.path.join(distroot, reference)
         shutil.copytree(src_path, dst_path)
+    else:
+        sys.exit("Documentation not found. Please pass -Dgtk_doc=true and to Meson and run ninja once.")
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