releasenotes: replace abort with warning while parsing (issue5775)

During the 4.5 development cycle, the extension broke on two different changesets.
This fixes the issue by ensuring that it just throws a warning when it encounters
unexpected behaviour, instead of aborting.

Differential Revision: https://phab.mercurial-scm.org/D2255

hgext/releasenotes.py

@@ -325,8 +325,8 b' def parsenotesfromrevisions(repo, direct'
                     continue
 
                 if pblock['type'] != 'paragraph':
-                    raise error.Abort(_('unexpected block in release notes '
-                                        'directive %s') % directive)
+                    repo.ui.warn(_('unexpected block in release notes '
+                                        'directive %s\n') % directive)
 
                 if pblock['indent'] > 0:
                     paragraphs.append(pblock['lines'])

tests/test-releasenotes-parsing.t

@@ -177,3 +177,26 b' Mixed sub-sections and bullet list'
       paragraph: Bullet item 1
     bullet point:
       paragraph: Bullet item 2
+
+Warn user in case of unexpected block while parsing
+
+  $ hg init relnotes-warn
+  $ cd relnotes-warn
+  $ touch feature1
+  $ hg -q commit -A -l - << EOF
+  > commit 1
+  > 
+  > .. feature::
+  > 
+  >    new feature added.
+  >     some words about the feature.
+  > EOF
+
+  $ hg releasenote -r .
+  unexpected block in release notes directive feature
+  New Features
+  ============
+  
+  * new feature added.  some words about the feature.
+
+  $ cd ..