Fix #2526: LaTeX writer crashes if the section having only images

CHANGES

@@ -51,6 +51,7 @@ Bugs fixed
 * #2501: Unicode subscript numbers are normalized in LaTeX
 * #2492: Figure directive with :figwidth: generates incorrect Latex-code
 * The caption of figure is always put on center even if ``:align:`` was specified
+* #2526: LaTeX writer crashes if the section having only images
 
 
 Release 1.4.1 (released Apr 12, 2016)

sphinx/writers/latex.py

@@ -782,7 +782,8 @@ class LaTeXTranslator(nodes.NodeVisitor):
         elif isinstance(parent, nodes.section):
             short = ''
             if node.traverse(nodes.image):
-                short = '[%s]' % ' '.join(clean_astext(node).split()).translate(tex_escape_map)
+                short = ('[%s]' %
+                         u' '.join(clean_astext(node).split()).translate(tex_escape_map))
 
             try:
                 self.body.append(r'\%s%s{' % (self.sectionnames[self.sectionlevel], short))

tests/roots/test-image-in-section/index.rst

@@ -16,3 +16,7 @@ another blah
 Other [blah] |picture| section
 ------------------------------
 other blah
+
+|picture|
+---------
+blah blah blah