Merge with '87998df9cbef2380345d436121e6bca43345d2bd' on stable

Conflicts:
	tests/test_build_latex.py

tests/root/markup.txt

@@ -187,6 +187,15 @@ Tables
    | 2  | Empty cells:   |    |
    +----+----------------+----+
 
+.. table:: empty cell in table header
+
+   ===== ======
+   \ 
+   ===== ======
+   1     2
+   3     4
+   ===== ======
+
 Tables with multirow and multicol:
 
 .. only:: latex

tests/root/math.txt

@@ -1,5 +1,5 @@
-Test math extensions
-====================
+Test math extensions :math:`E = m c^2`
+======================================
 
 This is inline math: :math:`a^2 + b^2 = c^2`.
 
@@ -19,4 +19,8 @@ This is inline math: :math:`a^2 + b^2 = c^2`.
 
    e^{ix} = \cos x + i\sin x
 
+.. math::
+
+   n \in \mathbb N
+
 Referencing equation :eq:`foo`.