[LyX/master] Cmake tests: Test export xhtml always, independent of default output format

[Kornel Benko]

commit 953e56492a1e86e4d041ca8a3de317c968170aeb
Author: Kornel Benko <kor...@lyx.org>
Date:   Thu Apr 2 09:51:53 2015 +0200

    Cmake tests: Test export xhtml always, independent of default output format

diff --git a/development/autotests/ExportTests.cmake 
b/development/autotests/ExportTests.cmake
index 4dfea2c..50b4aa4 100644
--- a/development/autotests/ExportTests.cmake
+++ b/development/autotests/ExportTests.cmake
@@ -50,10 +50,12 @@ macro(getoutputformats filepath varname)
         set(out_formats "xhtml" ${PDF_FORMATS})
       elseif(_format MATCHES "dvi$")
         set(out_formats "xhtml" ${DVI_FORMATS})
+      elseif(_format MATCHES "xhtml")
+        set(out_formats "xhtml")
       else()
         # Respect all other output formats
-        # like "eps3", "xhtml"
-        set(out_formats ${_format})
+        # like "eps3"
+        set(out_formats "xhtml" ${_format})
       endif()
       break()
     endif()