fix COUCHDB-593, thanks Roger Binns for reporting

git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@887791 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 25 insertions, 2 deletions

diff --git a/share/server/render.js b/share/server/render.js
index 82ceb3ab..f147af89 100644
--- a/share/server/render.js
+++ b/share/server/render.js
@@ -197,6 +197,21 @@ function resetProvides() {
   responseContentType = null;  
 };
 
+// from http://javascript.crockford.com/remedial.html
+function typeOf(value) {
+    var s = typeof value;
+    if (s === 'object') {
+        if (value) {
+            if (value instanceof Array) {
+                s = 'array';
+            }
+        } else {
+            s = 'null';
+        }
+    }
+    return s;
+};
+
 function runShow(showFun, doc, req, funSrc) {
   try {
     resetProvides();
@@ -206,8 +221,9 @@ function runShow(showFun, doc, req, funSrc) {
       resp = runProvides(req);
       resp = applyContentType(maybeWrapResponse(resp), responseContentType);
     }
-    
-    if (resp) {
+
+    var type = typeOf(resp);
+    if (type == 'object' || type == 'string') {
       respond(["resp", maybeWrapResponse(resp)]);
     } else {
       renderError("undefined response from show function");
diff --git a/share/www/script/test/show_documents.js b/share/www/script/test/show_documents.js
index d0a2325a..ae4368a8 100644
--- a/share/www/script/test/show_documents.js
+++ b/share/www/script/test/show_documents.js
@@ -56,6 +56,9 @@ couchTests.show_documents = function(debug) {
       "render-error" : stringFun(function(doc, req) {
         return noSuchVariable;
       }),
+      "empty" : stringFun(function(doc, req) {
+          return "";
+        }),
       "xml-type" : stringFun(function(doc, req) {
          return {
            "headers" : {
@@ -159,6 +162,10 @@ couchTests.show_documents = function(debug) {
   xhr = CouchDB.request("GET", "/test_suite_db/_design/template/_show/hello");
   T(xhr.responseText == "Empty World");
 
+  // hello template world (no docid)
+  xhr = CouchDB.request("GET", "/test_suite_db/_design/template/_show/empty");
+  T(xhr.responseText == "");
+
   // // hello template world (non-existing docid)
   xhr = CouchDB.request("GET", "/test_suite_db/_design/template/_show/hello/nonExistingDoc");
   T(xhr.responseText == "New World");