MLA: Consistent container 1/2 conditions

Author: adunning

templates/modern-language-association-template.csl

@@ -950,8 +950,8 @@
   <macro name="container2">
     <group delimiter=", ">
       <choose>
-        <if match="none" variable="DOI URL"/>
-        <else-if variable="source">
+        <if match="none" variable="source"/>
+        <else-if match="any" variable="DOI URL">
           <!-- Title of Container -->
           <text font-style="italic" variable="source"/>
           <!-- Location -->