using the publisher information for the author field if no author is

given. This applies to cases where only the copyright field in the html
header is filled but not the author field

source/net/yacy/search/index/SolrConfiguration.java

@@ -384,7 +384,11 @@ public class SolrConfiguration extends ConfigurationSet implements Serializable
             add(doc, YaCySchema.description_words_val, cv);
         }
 
-        if (allAttr || contains(YaCySchema.author)) add(doc, YaCySchema.author, document.dc_creator());
+        if (allAttr || contains(YaCySchema.author)) {
+            String author = document.dc_creator();
+            if (author == null || author.length() == 0) author = document.dc_publisher();
+            add(doc, YaCySchema.author, author);
+        }
         if (allAttr || contains(YaCySchema.content_type)) add(doc, YaCySchema.content_type, new String[]{document.dc_format()});
         if (allAttr || contains(YaCySchema.last_modified)) add(doc, YaCySchema.last_modified, responseHeader == null ? new Date() : responseHeader.lastModified());
         if (allAttr || contains(YaCySchema.keywords)) add(doc, YaCySchema.keywords, document.dc_subject(' '));