Modify rst_to_html for consistency.

Without this additional option, the rst block generated is very different depending on if you have one or multiple top-level sections defined. In fact the top-level title is removed completely without this (given our template doesn't include %(body_pre_docinfo)s).

For more information see - https://biostar.usegalaxy.org/p/11211/.

lib/galaxy/util/__init__.py

@@ -693,11 +693,18 @@ class FakeStream( object ):
         def write( self, str ):
             if len( str ) > 0 and not str.isspace():
                 log.warn( str )
+
+    settings_overrides = {
+        "embed_stylesheet": False,
+        "template": os.path.join(os.path.dirname(__file__), "docutils_template.txt"),
+        "warning_stream": FakeStream(),
+        "doctitle_xform": False,  # without option, very different rendering depending on
+                                  # number of sections in help content.
+    }
+
     return unicodify( docutils.core.publish_string( s,
                       writer=docutils.writers.html4css1.Writer(),
-                      settings_overrides={ "embed_stylesheet": False,
-                                           "template": os.path.join(os.path.dirname(__file__), "docutils_template.txt"),
-                                           "warning_stream": FakeStream() } ) )
+                      settings_overrides=settings_overrides ) )
 
 
 def xml_text(root, name=None):