Fix token column in corpusQuery results

Change-Id: I439480381684abd0a9dbaa9bf19feff06c62fd2c
diff --git a/R/KorAPQuery.R b/R/KorAPQuery.R
index a9882cb..8e72b60 100644
--- a/R/KorAPQuery.R
+++ b/R/KorAPQuery.R
@@ -323,6 +323,9 @@
       if("snippet" %in% colnames(res$matches)) {
         currentMatches$snippet <- res$matches$snippet
       }
+      if ("tokens" %in% colnames(res$matches)) {
+        currentMatches$tokens <- res$matches$tokens
+      }
     } else {
       currentMatches <- res$matches
     }