MHRA: Options for place of publication (#7483)

Author: adunning

modern-humanities-research-association-author-date.csl

@@ -194,10 +194,14 @@
         <text variable="publisher"/>
       </if>
       <else>
-        <group delimiter=": ">
-          <!-- <text variable="publisher-place"/> -->
-          <text variable="publisher"/>
-        </group>
+        <choose>
+          <if match="none" variable="publisher">
+            <text variable="publisher-place"/>
+          </if>
+          <else>
+            <text variable="publisher"/>
+          </else>
+        </choose>
       </else>
     </choose>
   </macro>